format/FlightSql.proto

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

 syntax = "proto3";
 import "google/protobuf/descriptor.proto";
 
 option java_package = "org.apache.arrow.flight.sql.impl";
 option go_package = "github.com/apache/arrow/go/arrow/flight/internal/flight";
 package arrow.flight.protocol.sql;
 
 /*
  * Represents a metadata request. Used in the command member of FlightDescriptor
  * for the following RPC calls:
  *  - GetSchema: return the Arrow schema of the query.
  *  - GetFlightInfo: execute the metadata request.
  *
  * The returned Arrow schema will be:
  * <
  *  info_name: uint32 not null,
  *  value: dense_union<
  *              string_value: utf8,
  *              bool_value: bool,
  *              bigint_value: int64,
  *              int32_bitmask: int32,
  *              string_list: list<string_data: utf8>
  *              int32_to_int32_list_map: map<key: int32, value: list<$data$: int32>>
  * >
  * where there is one row per requested piece of metadata information.
  */
 message CommandGetSqlInfo {
   option (experimental) = true;
 
   /*
    * Values are modelled after ODBC's SQLGetInfo() function. This information is intended to provide
    * Flight SQL clients with basic, SQL syntax and SQL functions related information.
    * More information types can be added in future releases.
    * E.g. more SQL syntax support types, scalar functions support, type conversion support etc.
    *
    * Note that the set of metadata may expand.
    *
    * Initially, Flight SQL will support the following information types:
    * - Server Information - Range [0-500)
    * - Syntax Information - Range [500-1000)
    * Range [0-10,000) is reserved for defaults (see SqlInfo enum for default options).
    * Custom options should start at 10,000.
    *
    * If omitted, then all metadata will be retrieved.
    * Flight SQL Servers may choose to include additional metadata above and beyond the specified set, however they must
    * at least return the specified set. IDs ranging from 0 to 10,000 (exclusive) are reserved for future use.
    * If additional metadata is included, the metadata IDs should start from 10,000.
    */
   repeated uint32 info = 1;
 }
 
 // Options for CommandGetSqlInfo.
 enum SqlInfo {
 
   // Server Information [0-500): Provides basic information about the Flight SQL Server.
 
   // Retrieves a UTF-8 string with the name of the Flight SQL Server.
   FLIGHT_SQL_SERVER_NAME = 0;
 
   // Retrieves a UTF-8 string with the native version of the Flight SQL Server.
   FLIGHT_SQL_SERVER_VERSION = 1;
 
   // Retrieves a UTF-8 string with the Arrow format version of the Flight SQL Server.
   FLIGHT_SQL_SERVER_ARROW_VERSION = 2;
 
   /*
    * Retrieves a boolean value indicating whether the Flight SQL Server is read only.
    *
    * Returns:
    * - false: if read-write
    * - true: if read only
    */
   FLIGHT_SQL_SERVER_READ_ONLY = 3;
 
   /*
    * Retrieves a boolean value indicating whether the Flight SQL Server supports executing
    * SQL queries.
    *
    * Note that the absence of this info (as opposed to a false value) does not necessarily
    * mean that SQL is not supported, as this property was not originally defined.
    */
   FLIGHT_SQL_SERVER_SQL = 4;
 
   /*
    * Retrieves a boolean value indicating whether the Flight SQL Server supports executing
    * Substrait plans.
    */
   FLIGHT_SQL_SERVER_SUBSTRAIT = 5;
 
   /*
    * Retrieves a string value indicating the minimum supported Substrait version, or null
    * if Substrait is not supported.
    */
   FLIGHT_SQL_SERVER_SUBSTRAIT_MIN_VERSION = 6;
 
   /*
    * Retrieves a string value indicating the maximum supported Substrait version, or null
    * if Substrait is not supported.
    */
   FLIGHT_SQL_SERVER_SUBSTRAIT_MAX_VERSION = 7;
 
   /*
    * Retrieves an int32 indicating whether the Flight SQL Server supports the
    * BeginTransaction/EndTransaction/BeginSavepoint/EndSavepoint actions.
    *
    * Even if this is not supported, the database may still support explicit "BEGIN
    * TRANSACTION"/"COMMIT" SQL statements (see SQL_TRANSACTIONS_SUPPORTED); this property
    * is only about whether the server implements the Flight SQL API endpoints.
    *
    * The possible values are listed in `SqlSupportedTransaction`.
    */
   FLIGHT_SQL_SERVER_TRANSACTION = 8;
 
   /*
    * Retrieves a boolean value indicating whether the Flight SQL Server supports explicit
    * query cancellation (the CancelQuery action).
    */
   FLIGHT_SQL_SERVER_CANCEL = 9;
 
   /*
    * Retrieves an int32 indicating the timeout (in milliseconds) for prepared statement handles.
    *
    * If 0, there is no timeout.  Servers should reset the timeout when the handle is used in a command.
    */
   FLIGHT_SQL_SERVER_STATEMENT_TIMEOUT = 100;
 
   /*
    * Retrieves an int32 indicating the timeout (in milliseconds) for transactions, since transactions are not tied to a connection.
    *
    * If 0, there is no timeout.  Servers should reset the timeout when the handle is used in a command.
    */
   FLIGHT_SQL_SERVER_TRANSACTION_TIMEOUT = 101;
 
   // SQL Syntax Information [500-1000): provides information about SQL syntax supported by the Flight SQL Server.
 
   /*
    * Retrieves a boolean value indicating whether the Flight SQL Server supports CREATE and DROP of catalogs.
    *
    * Returns:
    * - false: if it doesn't support CREATE and DROP of catalogs.
    * - true: if it supports CREATE and DROP of catalogs.
    */
   SQL_DDL_CATALOG = 500;
 
   /*
    * Retrieves a boolean value indicating whether the Flight SQL Server supports CREATE and DROP of schemas.
    *
    * Returns:
    * - false: if it doesn't support CREATE and DROP of schemas.
    * - true: if it supports CREATE and DROP of schemas.
    */
   SQL_DDL_SCHEMA = 501;
 
   /*
    * Indicates whether the Flight SQL Server supports CREATE and DROP of tables.
    *
    * Returns:
    * - false: if it doesn't support CREATE and DROP of tables.
    * - true: if it supports CREATE and DROP of tables.
    */
   SQL_DDL_TABLE = 502;
 
   /*
    * Retrieves a int32 ordinal representing the case sensitivity of catalog, table, schema and table names.
    *
    * The possible values are listed in `arrow.flight.protocol.sql.SqlSupportedCaseSensitivity`.
    */
   SQL_IDENTIFIER_CASE = 503;
 
   // Retrieves a UTF-8 string with the supported character(s) used to surround a delimited identifier.
   SQL_IDENTIFIER_QUOTE_CHAR = 504;
 
   /*
    * Retrieves a int32 describing the case sensitivity of quoted identifiers.
    *
    * The possible values are listed in `arrow.flight.protocol.sql.SqlSupportedCaseSensitivity`.
    */
   SQL_QUOTED_IDENTIFIER_CASE = 505;
 
   /*
    * Retrieves a boolean value indicating whether all tables are selectable.
    *
    * Returns:
    * - false: if not all tables are selectable or if none are;
    * - true: if all tables are selectable.
    */
   SQL_ALL_TABLES_ARE_SELECTABLE = 506;
 
   /*
    * Retrieves the null ordering.
    *
    * Returns a int32 ordinal for the null ordering being used, as described in
    * `arrow.flight.protocol.sql.SqlNullOrdering`.
    */
   SQL_NULL_ORDERING = 507;
 
   // Retrieves a UTF-8 string list with values of the supported keywords.
   SQL_KEYWORDS = 508;
 
   // Retrieves a UTF-8 string list with values of the supported numeric functions.
   SQL_NUMERIC_FUNCTIONS = 509;
 
   // Retrieves a UTF-8 string list with values of the supported string functions.
   SQL_STRING_FUNCTIONS = 510;
 
   // Retrieves a UTF-8 string list with values of the supported system functions.
   SQL_SYSTEM_FUNCTIONS = 511;
 
   // Retrieves a UTF-8 string list with values of the supported datetime functions.
   SQL_DATETIME_FUNCTIONS = 512;
 
   /*
    * Retrieves the UTF-8 string that can be used to escape wildcard characters.
    * This is the string that can be used to escape '_' or '%' in the catalog search parameters that are a pattern
    * (and therefore use one of the wildcard characters).
    * The '_' character represents any single character; the '%' character represents any sequence of zero or more
    * characters.
    */
   SQL_SEARCH_STRING_ESCAPE = 513;
 
   /*
    * Retrieves a UTF-8 string with all the "extra" characters that can be used in unquoted identifier names
    * (those beyond a-z, A-Z, 0-9 and _).
    */
   SQL_EXTRA_NAME_CHARACTERS = 514;
 
   /*
    * Retrieves a boolean value indicating whether column aliasing is supported.
    * If so, the SQL AS clause can be used to provide names for computed columns or to provide alias names for columns
    * as required.
    *
    * Returns:
    * - false: if column aliasing is unsupported;
    * - true: if column aliasing is supported.
    */
   SQL_SUPPORTS_COLUMN_ALIASING = 515;
 
   /*
    * Retrieves a boolean value indicating whether concatenations between null and non-null values being
    * null are supported.
    *
    * - Returns:
    * - false: if concatenations between null and non-null values being null are unsupported;
    * - true: if concatenations between null and non-null values being null are supported.
    */
   SQL_NULL_PLUS_NULL_IS_NULL = 516;
 
   /*
    * Retrieves a map where the key is the type to convert from and the value is a list with the types to convert to,
    * indicating the supported conversions. Each key and each item on the list value is a value to a predefined type on
    * SqlSupportsConvert enum.
    * The returned map will be:  map<int32, list<int32>>
    */
   SQL_SUPPORTS_CONVERT = 517;
 
   /*
    * Retrieves a boolean value indicating whether, when table correlation names are supported,
    * they are restricted to being different from the names of the tables.
    *
    * Returns:
    * - false: if table correlation names are unsupported;
    * - true: if table correlation names are supported.
    */
   SQL_SUPPORTS_TABLE_CORRELATION_NAMES = 518;
 
   /*
    * Retrieves a boolean value indicating whether, when table correlation names are supported,
    * they are restricted to being different from the names of the tables.
    *
    * Returns:
    * - false: if different table correlation names are unsupported;
    * - true: if different table correlation names are supported
    */
   SQL_SUPPORTS_DIFFERENT_TABLE_CORRELATION_NAMES = 519;
 
   /*
    * Retrieves a boolean value indicating whether expressions in ORDER BY lists are supported.
    *
    * Returns:
    * - false: if expressions in ORDER BY are unsupported;
    * - true: if expressions in ORDER BY are supported;
    */
   SQL_SUPPORTS_EXPRESSIONS_IN_ORDER_BY = 520;
 
   /*
    * Retrieves a boolean value indicating whether using a column that is not in the SELECT statement in a GROUP BY
    * clause is supported.
    *
    * Returns:
    * - false: if using a column that is not in the SELECT statement in a GROUP BY clause is unsupported;
    * - true: if using a column that is not in the SELECT statement in a GROUP BY clause is supported.
    */
   SQL_SUPPORTS_ORDER_BY_UNRELATED = 521;
 
   /*
    * Retrieves the supported GROUP BY commands;
    *
    * Returns an int32 bitmask value representing the supported commands.
    * The returned bitmask should be parsed in order to retrieve the supported commands.
    *
    * For instance:
    * - return 0 (\b0)   => [] (GROUP BY is unsupported);
    * - return 1 (\b1)   => [SQL_GROUP_BY_UNRELATED];
    * - return 2 (\b10)  => [SQL_GROUP_BY_BEYOND_SELECT];
    * - return 3 (\b11)  => [SQL_GROUP_BY_UNRELATED, SQL_GROUP_BY_BEYOND_SELECT].
    * Valid GROUP BY types are described under `arrow.flight.protocol.sql.SqlSupportedGroupBy`.
    */
   SQL_SUPPORTED_GROUP_BY = 522;
 
   /*
    * Retrieves a boolean value indicating whether specifying a LIKE escape clause is supported.
    *
    * Returns:
    * - false: if specifying a LIKE escape clause is unsupported;
    * - true: if specifying a LIKE escape clause is supported.
    */
   SQL_SUPPORTS_LIKE_ESCAPE_CLAUSE = 523;
 
   /*
    * Retrieves a boolean value indicating whether columns may be defined as non-nullable.
    *
    * Returns:
    * - false: if columns cannot be defined as non-nullable;
    * - true: if columns may be defined as non-nullable.
    */
   SQL_SUPPORTS_NON_NULLABLE_COLUMNS = 524;
 
   /*
    * Retrieves the supported SQL grammar level as per the ODBC specification.
    *
    * Returns an int32 bitmask value representing the supported SQL grammar level.
    * The returned bitmask should be parsed in order to retrieve the supported grammar levels.
    *
    * For instance:
    * - return 0 (\b0)   => [] (SQL grammar is unsupported);
    * - return 1 (\b1)   => [SQL_MINIMUM_GRAMMAR];
    * - return 2 (\b10)  => [SQL_CORE_GRAMMAR];
    * - return 3 (\b11)  => [SQL_MINIMUM_GRAMMAR, SQL_CORE_GRAMMAR];
    * - return 4 (\b100) => [SQL_EXTENDED_GRAMMAR];
    * - return 5 (\b101) => [SQL_MINIMUM_GRAMMAR, SQL_EXTENDED_GRAMMAR];
    * - return 6 (\b110) => [SQL_CORE_GRAMMAR, SQL_EXTENDED_GRAMMAR];
    * - return 7 (\b111) => [SQL_MINIMUM_GRAMMAR, SQL_CORE_GRAMMAR, SQL_EXTENDED_GRAMMAR].
    * Valid SQL grammar levels are described under `arrow.flight.protocol.sql.SupportedSqlGrammar`.
    */
   SQL_SUPPORTED_GRAMMAR = 525;
 
   /*
    * Retrieves the supported ANSI92 SQL grammar level.
    *
    * Returns an int32 bitmask value representing the supported ANSI92 SQL grammar level.
    * The returned bitmask should be parsed in order to retrieve the supported commands.
    *
    * For instance:
    * - return 0 (\b0)   => [] (ANSI92 SQL grammar is unsupported);
    * - return 1 (\b1)   => [ANSI92_ENTRY_SQL];
    * - return 2 (\b10)  => [ANSI92_INTERMEDIATE_SQL];
    * - return 3 (\b11)  => [ANSI92_ENTRY_SQL, ANSI92_INTERMEDIATE_SQL];
    * - return 4 (\b100) => [ANSI92_FULL_SQL];
    * - return 5 (\b101) => [ANSI92_ENTRY_SQL, ANSI92_FULL_SQL];
    * - return 6 (\b110) => [ANSI92_INTERMEDIATE_SQL, ANSI92_FULL_SQL];
    * - return 7 (\b111) => [ANSI92_ENTRY_SQL, ANSI92_INTERMEDIATE_SQL, ANSI92_FULL_SQL].
    * Valid ANSI92 SQL grammar levels are described under `arrow.flight.protocol.sql.SupportedAnsi92SqlGrammarLevel`.
    */
   SQL_ANSI92_SUPPORTED_LEVEL = 526;
 
   /*
    * Retrieves a boolean value indicating whether the SQL Integrity Enhancement Facility is supported.
    *
    * Returns:
    * - false: if the SQL Integrity Enhancement Facility is supported;
    * - true: if the SQL Integrity Enhancement Facility is supported.
    */
   SQL_SUPPORTS_INTEGRITY_ENHANCEMENT_FACILITY = 527;
 
   /*
    * Retrieves the support level for SQL OUTER JOINs.
    *
    * Returns a int32 ordinal for the SQL ordering being used, as described in
    * `arrow.flight.protocol.sql.SqlOuterJoinsSupportLevel`.
    */
   SQL_OUTER_JOINS_SUPPORT_LEVEL = 528;
 
   // Retrieves a UTF-8 string with the preferred term for "schema".
   SQL_SCHEMA_TERM = 529;
 
   // Retrieves a UTF-8 string with the preferred term for "procedure".
   SQL_PROCEDURE_TERM = 530;
 
   /*
    * Retrieves a UTF-8 string with the preferred term for "catalog".
    * If a empty string is returned its assumed that the server does NOT supports catalogs.
    */
   SQL_CATALOG_TERM = 531;
 
   /*
    * Retrieves a boolean value indicating whether a catalog appears at the start of a fully qualified table name.
    *
    * - false: if a catalog does not appear at the start of a fully qualified table name;
    * - true: if a catalog appears at the start of a fully qualified table name.
    */
   SQL_CATALOG_AT_START = 532;
 
   /*
    * Retrieves the supported actions for a SQL schema.
    *
    * Returns an int32 bitmask value representing the supported actions for a SQL schema.
    * The returned bitmask should be parsed in order to retrieve the supported actions for a SQL schema.
    *
    * For instance:
    * - return 0 (\b0)   => [] (no supported actions for SQL schema);
    * - return 1 (\b1)   => [SQL_ELEMENT_IN_PROCEDURE_CALLS];
    * - return 2 (\b10)  => [SQL_ELEMENT_IN_INDEX_DEFINITIONS];
    * - return 3 (\b11)  => [SQL_ELEMENT_IN_PROCEDURE_CALLS, SQL_ELEMENT_IN_INDEX_DEFINITIONS];
    * - return 4 (\b100) => [SQL_ELEMENT_IN_PRIVILEGE_DEFINITIONS];
    * - return 5 (\b101) => [SQL_ELEMENT_IN_PROCEDURE_CALLS, SQL_ELEMENT_IN_PRIVILEGE_DEFINITIONS];
    * - return 6 (\b110) => [SQL_ELEMENT_IN_INDEX_DEFINITIONS, SQL_ELEMENT_IN_PRIVILEGE_DEFINITIONS];
    * - return 7 (\b111) => [SQL_ELEMENT_IN_PROCEDURE_CALLS, SQL_ELEMENT_IN_INDEX_DEFINITIONS, SQL_ELEMENT_IN_PRIVILEGE_DEFINITIONS].
    * Valid actions for a SQL schema described under `arrow.flight.protocol.sql.SqlSupportedElementActions`.
    */
   SQL_SCHEMAS_SUPPORTED_ACTIONS = 533;
 
   /*
    * Retrieves the supported actions for a SQL schema.
    *
    * Returns an int32 bitmask value representing the supported actions for a SQL catalog.
    * The returned bitmask should be parsed in order to retrieve the supported actions for a SQL catalog.
    *
    * For instance:
    * - return 0 (\b0)   => [] (no supported actions for SQL catalog);
    * - return 1 (\b1)   => [SQL_ELEMENT_IN_PROCEDURE_CALLS];
    * - return 2 (\b10)  => [SQL_ELEMENT_IN_INDEX_DEFINITIONS];
    * - return 3 (\b11)  => [SQL_ELEMENT_IN_PROCEDURE_CALLS, SQL_ELEMENT_IN_INDEX_DEFINITIONS];
    * - return 4 (\b100) => [SQL_ELEMENT_IN_PRIVILEGE_DEFINITIONS];
    * - return 5 (\b101) => [SQL_ELEMENT_IN_PROCEDURE_CALLS, SQL_ELEMENT_IN_PRIVILEGE_DEFINITIONS];
    * - return 6 (\b110) => [SQL_ELEMENT_IN_INDEX_DEFINITIONS, SQL_ELEMENT_IN_PRIVILEGE_DEFINITIONS];
    * - return 7 (\b111) => [SQL_ELEMENT_IN_PROCEDURE_CALLS, SQL_ELEMENT_IN_INDEX_DEFINITIONS, SQL_ELEMENT_IN_PRIVILEGE_DEFINITIONS].
    * Valid actions for a SQL catalog are described under `arrow.flight.protocol.sql.SqlSupportedElementActions`.
    */
   SQL_CATALOGS_SUPPORTED_ACTIONS = 534;
 
   /*
    * Retrieves the supported SQL positioned commands.
    *
    * Returns an int32 bitmask value representing the supported SQL positioned commands.
    * The returned bitmask should be parsed in order to retrieve the supported SQL positioned commands.
    *
    * For instance:
    * - return 0 (\b0)   => [] (no supported SQL positioned commands);
    * - return 1 (\b1)   => [SQL_POSITIONED_DELETE];
    * - return 2 (\b10)  => [SQL_POSITIONED_UPDATE];
    * - return 3 (\b11)  => [SQL_POSITIONED_DELETE, SQL_POSITIONED_UPDATE].
    * Valid SQL positioned commands are described under `arrow.flight.protocol.sql.SqlSupportedPositionedCommands`.
    */
   SQL_SUPPORTED_POSITIONED_COMMANDS = 535;
 
   /*
    * Retrieves a boolean value indicating whether SELECT FOR UPDATE statements are supported.
    *
    * Returns:
    * - false: if SELECT FOR UPDATE statements are unsupported;
    * - true: if SELECT FOR UPDATE statements are supported.
    */
   SQL_SELECT_FOR_UPDATE_SUPPORTED = 536;
 
   /*
    * Retrieves a boolean value indicating whether stored procedure calls that use the stored procedure escape syntax
    * are supported.
    *
    * Returns:
    * - false: if stored procedure calls that use the stored procedure escape syntax are unsupported;
    * - true: if stored procedure calls that use the stored procedure escape syntax are supported.
    */
   SQL_STORED_PROCEDURES_SUPPORTED = 537;
 
   /*
    * Retrieves the supported SQL subqueries.
    *
    * Returns an int32 bitmask value representing the supported SQL subqueries.
    * The returned bitmask should be parsed in order to retrieve the supported SQL subqueries.
    *
    * For instance:
    * - return 0   (\b0)     => [] (no supported SQL subqueries);
    * - return 1   (\b1)     => [SQL_SUBQUERIES_IN_COMPARISONS];
    * - return 2   (\b10)    => [SQL_SUBQUERIES_IN_EXISTS];
    * - return 3   (\b11)    => [SQL_SUBQUERIES_IN_COMPARISONS, SQL_SUBQUERIES_IN_EXISTS];
    * - return 4   (\b100)   => [SQL_SUBQUERIES_IN_INS];
    * - return 5   (\b101)   => [SQL_SUBQUERIES_IN_COMPARISONS, SQL_SUBQUERIES_IN_INS];
    * - return 6   (\b110)   => [SQL_SUBQUERIES_IN_INS, SQL_SUBQUERIES_IN_EXISTS];
    * - return 7   (\b111)   => [SQL_SUBQUERIES_IN_COMPARISONS, SQL_SUBQUERIES_IN_EXISTS, SQL_SUBQUERIES_IN_INS];
    * - return 8   (\b1000)  => [SQL_SUBQUERIES_IN_QUANTIFIEDS];
    * - return 9   (\b1001)  => [SQL_SUBQUERIES_IN_COMPARISONS, SQL_SUBQUERIES_IN_QUANTIFIEDS];
    * - return 10  (\b1010)  => [SQL_SUBQUERIES_IN_EXISTS, SQL_SUBQUERIES_IN_QUANTIFIEDS];
    * - return 11  (\b1011)  => [SQL_SUBQUERIES_IN_COMPARISONS, SQL_SUBQUERIES_IN_EXISTS, SQL_SUBQUERIES_IN_QUANTIFIEDS];
    * - return 12  (\b1100)  => [SQL_SUBQUERIES_IN_INS, SQL_SUBQUERIES_IN_QUANTIFIEDS];
    * - return 13  (\b1101)  => [SQL_SUBQUERIES_IN_COMPARISONS, SQL_SUBQUERIES_IN_INS, SQL_SUBQUERIES_IN_QUANTIFIEDS];
    * - return 14  (\b1110)  => [SQL_SUBQUERIES_IN_EXISTS, SQL_SUBQUERIES_IN_INS, SQL_SUBQUERIES_IN_QUANTIFIEDS];
    * - return 15  (\b1111)  => [SQL_SUBQUERIES_IN_COMPARISONS, SQL_SUBQUERIES_IN_EXISTS, SQL_SUBQUERIES_IN_INS, SQL_SUBQUERIES_IN_QUANTIFIEDS];
    * - ...
    * Valid SQL subqueries are described under `arrow.flight.protocol.sql.SqlSupportedSubqueries`.
    */
   SQL_SUPPORTED_SUBQUERIES = 538;
 
   /*
    * Retrieves a boolean value indicating whether correlated subqueries are supported.
    *
    * Returns:
    * - false: if correlated subqueries are unsupported;
    * - true: if correlated subqueries are supported.
    */
   SQL_CORRELATED_SUBQUERIES_SUPPORTED = 539;
 
   /*
    * Retrieves the supported SQL UNIONs.
    *
    * Returns an int32 bitmask value representing the supported SQL UNIONs.
    * The returned bitmask should be parsed in order to retrieve the supported SQL UNIONs.
    *
    * For instance:
    * - return 0 (\b0)   => [] (no supported SQL positioned commands);
    * - return 1 (\b1)   => [SQL_UNION];
    * - return 2 (\b10)  => [SQL_UNION_ALL];
    * - return 3 (\b11)  => [SQL_UNION, SQL_UNION_ALL].
    * Valid SQL positioned commands are described under `arrow.flight.protocol.sql.SqlSupportedUnions`.
    */
   SQL_SUPPORTED_UNIONS = 540;
 
   // Retrieves a int64 value representing the maximum number of hex characters allowed in an inline binary literal.
   SQL_MAX_BINARY_LITERAL_LENGTH = 541;
 
   // Retrieves a int64 value representing the maximum number of characters allowed for a character literal.
   SQL_MAX_CHAR_LITERAL_LENGTH = 542;
 
   // Retrieves a int64 value representing the maximum number of characters allowed for a column name.
   SQL_MAX_COLUMN_NAME_LENGTH = 543;
 
   // Retrieves a int64 value representing the the maximum number of columns allowed in a GROUP BY clause.
   SQL_MAX_COLUMNS_IN_GROUP_BY = 544;
 
   // Retrieves a int64 value representing the maximum number of columns allowed in an index.
   SQL_MAX_COLUMNS_IN_INDEX = 545;
 
   // Retrieves a int64 value representing the maximum number of columns allowed in an ORDER BY clause.
   SQL_MAX_COLUMNS_IN_ORDER_BY = 546;
 
   // Retrieves a int64 value representing the maximum number of columns allowed in a SELECT list.
   SQL_MAX_COLUMNS_IN_SELECT = 547;
 
   // Retrieves a int64 value representing the maximum number of columns allowed in a table.
   SQL_MAX_COLUMNS_IN_TABLE = 548;
 
   // Retrieves a int64 value representing the maximum number of concurrent connections possible.
   SQL_MAX_CONNECTIONS = 549;
 
   // Retrieves a int64 value the maximum number of characters allowed in a cursor name.
   SQL_MAX_CURSOR_NAME_LENGTH = 550;
 
   /*
    * Retrieves a int64 value representing the maximum number of bytes allowed for an index,
    * including all of the parts of the index.
    */
   SQL_MAX_INDEX_LENGTH = 551;
 
   // Retrieves a int64 value representing the maximum number of characters allowed in a schema name.
   SQL_DB_SCHEMA_NAME_LENGTH = 552;
 
   // Retrieves a int64 value representing the maximum number of characters allowed in a procedure name.
   SQL_MAX_PROCEDURE_NAME_LENGTH = 553;
 
   // Retrieves a int64 value representing the maximum number of characters allowed in a catalog name.
   SQL_MAX_CATALOG_NAME_LENGTH = 554;
 
   // Retrieves a int64 value representing the maximum number of bytes allowed in a single row.
   SQL_MAX_ROW_SIZE = 555;
 
   /*
    * Retrieves a boolean indicating whether the return value for the JDBC method getMaxRowSize includes the SQL
    * data types LONGVARCHAR and LONGVARBINARY.
    *
    * Returns:
    * - false: if return value for the JDBC method getMaxRowSize does
    *          not include the SQL data types LONGVARCHAR and LONGVARBINARY;
    * - true: if return value for the JDBC method getMaxRowSize includes
    *         the SQL data types LONGVARCHAR and LONGVARBINARY.
    */
   SQL_MAX_ROW_SIZE_INCLUDES_BLOBS = 556;
 
   /*
    * Retrieves a int64 value representing the maximum number of characters allowed for an SQL statement;
    * a result of 0 (zero) means that there is no limit or the limit is not known.
    */
   SQL_MAX_STATEMENT_LENGTH = 557;
 
   // Retrieves a int64 value representing the maximum number of active statements that can be open at the same time.
   SQL_MAX_STATEMENTS = 558;
 
   // Retrieves a int64 value representing the maximum number of characters allowed in a table name.
   SQL_MAX_TABLE_NAME_LENGTH = 559;
 
   // Retrieves a int64 value representing the maximum number of tables allowed in a SELECT statement.
   SQL_MAX_TABLES_IN_SELECT = 560;
 
   // Retrieves a int64 value representing the maximum number of characters allowed in a user name.
   SQL_MAX_USERNAME_LENGTH = 561;
 
   /*
    * Retrieves this database's default transaction isolation level as described in
    * `arrow.flight.protocol.sql.SqlTransactionIsolationLevel`.
    *
    * Returns a int32 ordinal for the SQL transaction isolation level.
    */
   SQL_DEFAULT_TRANSACTION_ISOLATION = 562;
 
   /*
    * Retrieves a boolean value indicating whether transactions are supported. If not, invoking the method commit is a
    * noop, and the isolation level is `arrow.flight.protocol.sql.SqlTransactionIsolationLevel.TRANSACTION_NONE`.
    *
    * Returns:
    * - false: if transactions are unsupported;
    * - true: if transactions are supported.
    */
   SQL_TRANSACTIONS_SUPPORTED = 563;
 
   /*
    * Retrieves the supported transactions isolation levels.
    *
    * Returns an int32 bitmask value representing the supported transactions isolation levels.
    * The returned bitmask should be parsed in order to retrieve the supported transactions isolation levels.
    *
    * For instance:
    * - return 0   (\b0)     => [] (no supported SQL transactions isolation levels);
    * - return 1   (\b1)     => [SQL_TRANSACTION_NONE];
    * - return 2   (\b10)    => [SQL_TRANSACTION_READ_UNCOMMITTED];
    * - return 3   (\b11)    => [SQL_TRANSACTION_NONE, SQL_TRANSACTION_READ_UNCOMMITTED];
    * - return 4   (\b100)   => [SQL_TRANSACTION_REPEATABLE_READ];
    * - return 5   (\b101)   => [SQL_TRANSACTION_NONE, SQL_TRANSACTION_REPEATABLE_READ];
    * - return 6   (\b110)   => [SQL_TRANSACTION_READ_UNCOMMITTED, SQL_TRANSACTION_REPEATABLE_READ];
    * - return 7   (\b111)   => [SQL_TRANSACTION_NONE, SQL_TRANSACTION_READ_UNCOMMITTED, SQL_TRANSACTION_REPEATABLE_READ];
    * - return 8   (\b1000)  => [SQL_TRANSACTION_REPEATABLE_READ];
    * - return 9   (\b1001)  => [SQL_TRANSACTION_NONE, SQL_TRANSACTION_REPEATABLE_READ];
    * - return 10  (\b1010)  => [SQL_TRANSACTION_READ_UNCOMMITTED, SQL_TRANSACTION_REPEATABLE_READ];
    * - return 11  (\b1011)  => [SQL_TRANSACTION_NONE, SQL_TRANSACTION_READ_UNCOMMITTED, SQL_TRANSACTION_REPEATABLE_READ];
    * - return 12  (\b1100)  => [SQL_TRANSACTION_REPEATABLE_READ, SQL_TRANSACTION_REPEATABLE_READ];
    * - return 13  (\b1101)  => [SQL_TRANSACTION_NONE, SQL_TRANSACTION_REPEATABLE_READ, SQL_TRANSACTION_REPEATABLE_READ];
    * - return 14  (\b1110)  => [SQL_TRANSACTION_READ_UNCOMMITTED, SQL_TRANSACTION_REPEATABLE_READ, SQL_TRANSACTION_REPEATABLE_READ];
    * - return 15  (\b1111)  => [SQL_TRANSACTION_NONE, SQL_TRANSACTION_READ_UNCOMMITTED, SQL_TRANSACTION_REPEATABLE_READ, SQL_TRANSACTION_REPEATABLE_READ];
    * - return 16  (\b10000) => [SQL_TRANSACTION_SERIALIZABLE];
    * - ...
    * Valid SQL positioned commands are described under `arrow.flight.protocol.sql.SqlTransactionIsolationLevel`.
    */
   SQL_SUPPORTED_TRANSACTIONS_ISOLATION_LEVELS = 564;
 
   /*
    * Retrieves a boolean value indicating whether a data definition statement within a transaction forces
    * the transaction to commit.
    *
    * Returns:
    * - false: if a data definition statement within a transaction does not force the transaction to commit;
    * - true: if a data definition statement within a transaction forces the transaction to commit.
    */
   SQL_DATA_DEFINITION_CAUSES_TRANSACTION_COMMIT = 565;
 
   /*
    * Retrieves a boolean value indicating whether a data definition statement within a transaction is ignored.
    *
    * Returns:
    * - false: if a data definition statement within a transaction is taken into account;
    * - true: a data definition statement within a transaction is ignored.
    */
   SQL_DATA_DEFINITIONS_IN_TRANSACTIONS_IGNORED = 566;
 
   /*
    * Retrieves an int32 bitmask value representing the supported result set types.
    * The returned bitmask should be parsed in order to retrieve the supported result set types.
    *
    * For instance:
    * - return 0   (\b0)     => [] (no supported result set types);
    * - return 1   (\b1)     => [SQL_RESULT_SET_TYPE_UNSPECIFIED];
    * - return 2   (\b10)    => [SQL_RESULT_SET_TYPE_FORWARD_ONLY];
    * - return 3   (\b11)    => [SQL_RESULT_SET_TYPE_UNSPECIFIED, SQL_RESULT_SET_TYPE_FORWARD_ONLY];
    * - return 4   (\b100)   => [SQL_RESULT_SET_TYPE_SCROLL_INSENSITIVE];
    * - return 5   (\b101)   => [SQL_RESULT_SET_TYPE_UNSPECIFIED, SQL_RESULT_SET_TYPE_SCROLL_INSENSITIVE];
    * - return 6   (\b110)   => [SQL_RESULT_SET_TYPE_FORWARD_ONLY, SQL_RESULT_SET_TYPE_SCROLL_INSENSITIVE];
    * - return 7   (\b111)   => [SQL_RESULT_SET_TYPE_UNSPECIFIED, SQL_RESULT_SET_TYPE_FORWARD_ONLY, SQL_RESULT_SET_TYPE_SCROLL_INSENSITIVE];
    * - return 8   (\b1000)  => [SQL_RESULT_SET_TYPE_SCROLL_SENSITIVE];
    * - ...
    * Valid result set types are described under `arrow.flight.protocol.sql.SqlSupportedResultSetType`.
    */
   SQL_SUPPORTED_RESULT_SET_TYPES = 567;
 
   /*
    * Returns an int32 bitmask value concurrency types supported for
    * `arrow.flight.protocol.sql.SqlSupportedResultSetType.SQL_RESULT_SET_TYPE_UNSPECIFIED`.
    *
    * For instance:
    * - return 0 (\b0)   => [] (no supported concurrency types for this result set type)
    * - return 1 (\b1)   => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED]
    * - return 2 (\b10)  => [SQL_RESULT_SET_CONCURRENCY_READ_ONLY]
    * - return 3 (\b11)  => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_READ_ONLY]
    * - return 4 (\b100) => [SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
    * - return 5 (\b101) => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
    * - return 6 (\b110)  => [SQL_RESULT_SET_CONCURRENCY_READ_ONLY, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
    * - return 7 (\b111)  => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_READ_ONLY, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
    * Valid result set types are described under `arrow.flight.protocol.sql.SqlSupportedResultSetConcurrency`.
    */
   SQL_SUPPORTED_CONCURRENCIES_FOR_RESULT_SET_UNSPECIFIED = 568;
 
   /*
    * Returns an int32 bitmask value concurrency types supported for
    * `arrow.flight.protocol.sql.SqlSupportedResultSetType.SQL_RESULT_SET_TYPE_FORWARD_ONLY`.
    *
    * For instance:
    * - return 0 (\b0)   => [] (no supported concurrency types for this result set type)
    * - return 1 (\b1)   => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED]
    * - return 2 (\b10)  => [SQL_RESULT_SET_CONCURRENCY_READ_ONLY]
    * - return 3 (\b11)  => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_READ_ONLY]
    * - return 4 (\b100) => [SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
    * - return 5 (\b101) => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
    * - return 6 (\b110)  => [SQL_RESULT_SET_CONCURRENCY_READ_ONLY, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
    * - return 7 (\b111)  => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_READ_ONLY, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
    * Valid result set types are described under `arrow.flight.protocol.sql.SqlSupportedResultSetConcurrency`.
    */
   SQL_SUPPORTED_CONCURRENCIES_FOR_RESULT_SET_FORWARD_ONLY = 569;
 
   /*
    * Returns an int32 bitmask value concurrency types supported for
    * `arrow.flight.protocol.sql.SqlSupportedResultSetType.SQL_RESULT_SET_TYPE_SCROLL_SENSITIVE`.
    *
    * For instance:
    * - return 0 (\b0)   => [] (no supported concurrency types for this result set type)
    * - return 1 (\b1)   => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED]
    * - return 2 (\b10)  => [SQL_RESULT_SET_CONCURRENCY_READ_ONLY]
    * - return 3 (\b11)  => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_READ_ONLY]
    * - return 4 (\b100) => [SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
    * - return 5 (\b101) => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
    * - return 6 (\b110)  => [SQL_RESULT_SET_CONCURRENCY_READ_ONLY, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
    * - return 7 (\b111)  => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_READ_ONLY, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
    * Valid result set types are described under `arrow.flight.protocol.sql.SqlSupportedResultSetConcurrency`.
    */
   SQL_SUPPORTED_CONCURRENCIES_FOR_RESULT_SET_SCROLL_SENSITIVE = 570;
 
   /*
    * Returns an int32 bitmask value concurrency types supported for
    * `arrow.flight.protocol.sql.SqlSupportedResultSetType.SQL_RESULT_SET_TYPE_SCROLL_INSENSITIVE`.
    *
    * For instance:
    * - return 0 (\b0)   => [] (no supported concurrency types for this result set type)
    * - return 1 (\b1)   => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED]
    * - return 2 (\b10)  => [SQL_RESULT_SET_CONCURRENCY_READ_ONLY]
    * - return 3 (\b11)  => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_READ_ONLY]
    * - return 4 (\b100) => [SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
    * - return 5 (\b101) => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
    * - return 6 (\b110)  => [SQL_RESULT_SET_CONCURRENCY_READ_ONLY, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
    * - return 7 (\b111)  => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_READ_ONLY, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
    * Valid result set types are described under `arrow.flight.protocol.sql.SqlSupportedResultSetConcurrency`.
    */
   SQL_SUPPORTED_CONCURRENCIES_FOR_RESULT_SET_SCROLL_INSENSITIVE = 571;
 
   /*
    * Retrieves a boolean value indicating whether this database supports batch updates.
    *
    * - false: if this database does not support batch updates;
    * - true: if this database supports batch updates.
    */
   SQL_BATCH_UPDATES_SUPPORTED = 572;
 
   /*
    * Retrieves a boolean value indicating whether this database supports savepoints.
    *
    * Returns:
    * - false: if this database does not support savepoints;
    * - true: if this database supports savepoints.
    */
   SQL_SAVEPOINTS_SUPPORTED = 573;
 
   /*
    * Retrieves a boolean value indicating whether named parameters are supported in callable statements.
    *
    * Returns:
    * - false: if named parameters in callable statements are unsupported;
    * - true: if named parameters in callable statements are supported.
    */
   SQL_NAMED_PARAMETERS_SUPPORTED = 574;
 
   /*
    * Retrieves a boolean value indicating whether updates made to a LOB are made on a copy or directly to the LOB.
    *
    * Returns:
    * - false: if updates made to a LOB are made directly to the LOB;
    * - true: if updates made to a LOB are made on a copy.
    */
   SQL_LOCATORS_UPDATE_COPY = 575;
 
   /*
    * Retrieves a boolean value indicating whether invoking user-defined or vendor functions
    * using the stored procedure escape syntax is supported.
    *
    * Returns:
    * - false: if invoking user-defined or vendor functions using the stored procedure escape syntax is unsupported;
    * - true: if invoking user-defined or vendor functions using the stored procedure escape syntax is supported.
    */
   SQL_STORED_FUNCTIONS_USING_CALL_SYNTAX_SUPPORTED = 576;
 }
 
 // The level of support for Flight SQL transaction RPCs.
 enum SqlSupportedTransaction {
   // Unknown/not indicated/no support
   SQL_SUPPORTED_TRANSACTION_NONE = 0;
   // Transactions, but not savepoints.
   // A savepoint is a mark within a transaction that can be individually
   // rolled back to. Not all databases support savepoints.
   SQL_SUPPORTED_TRANSACTION_TRANSACTION = 1;
   // Transactions and savepoints
   SQL_SUPPORTED_TRANSACTION_SAVEPOINT = 2;
 }
 
 enum SqlSupportedCaseSensitivity {
   SQL_CASE_SENSITIVITY_UNKNOWN = 0;
   SQL_CASE_SENSITIVITY_CASE_INSENSITIVE = 1;
   SQL_CASE_SENSITIVITY_UPPERCASE = 2;
   SQL_CASE_SENSITIVITY_LOWERCASE = 3;
 }
 
 enum SqlNullOrdering {
   SQL_NULLS_SORTED_HIGH = 0;
   SQL_NULLS_SORTED_LOW = 1;
   SQL_NULLS_SORTED_AT_START = 2;
   SQL_NULLS_SORTED_AT_END = 3;
 }
 
 enum SupportedSqlGrammar {
   SQL_MINIMUM_GRAMMAR = 0;
   SQL_CORE_GRAMMAR = 1;
   SQL_EXTENDED_GRAMMAR = 2;
 }
 
 enum SupportedAnsi92SqlGrammarLevel {
   ANSI92_ENTRY_SQL = 0;
   ANSI92_INTERMEDIATE_SQL = 1;
   ANSI92_FULL_SQL = 2;
 }
 
 enum SqlOuterJoinsSupportLevel {
   SQL_JOINS_UNSUPPORTED = 0;
   SQL_LIMITED_OUTER_JOINS = 1;
   SQL_FULL_OUTER_JOINS = 2;
 }
 
 enum SqlSupportedGroupBy {
   SQL_GROUP_BY_UNRELATED = 0;
   SQL_GROUP_BY_BEYOND_SELECT = 1;
 }
 
 enum SqlSupportedElementActions {
   SQL_ELEMENT_IN_PROCEDURE_CALLS = 0;
   SQL_ELEMENT_IN_INDEX_DEFINITIONS = 1;
   SQL_ELEMENT_IN_PRIVILEGE_DEFINITIONS = 2;
 }
 
 enum SqlSupportedPositionedCommands {
   SQL_POSITIONED_DELETE = 0;
   SQL_POSITIONED_UPDATE = 1;
 }
 
 enum SqlSupportedSubqueries {
   SQL_SUBQUERIES_IN_COMPARISONS = 0;
   SQL_SUBQUERIES_IN_EXISTS = 1;
   SQL_SUBQUERIES_IN_INS = 2;
   SQL_SUBQUERIES_IN_QUANTIFIEDS = 3;
 }
 
 enum SqlSupportedUnions {
   SQL_UNION = 0;
   SQL_UNION_ALL = 1;
 }
 
 enum SqlTransactionIsolationLevel {
   SQL_TRANSACTION_NONE = 0;
   SQL_TRANSACTION_READ_UNCOMMITTED = 1;
   SQL_TRANSACTION_READ_COMMITTED = 2;
   SQL_TRANSACTION_REPEATABLE_READ = 3;
   SQL_TRANSACTION_SERIALIZABLE = 4;
 }
 
 enum SqlSupportedTransactions {
   SQL_TRANSACTION_UNSPECIFIED = 0;
   SQL_DATA_DEFINITION_TRANSACTIONS = 1;
   SQL_DATA_MANIPULATION_TRANSACTIONS = 2;
 }
 
 enum SqlSupportedResultSetType {
   SQL_RESULT_SET_TYPE_UNSPECIFIED = 0;
   SQL_RESULT_SET_TYPE_FORWARD_ONLY = 1;
   SQL_RESULT_SET_TYPE_SCROLL_INSENSITIVE = 2;
   SQL_RESULT_SET_TYPE_SCROLL_SENSITIVE = 3;
 }
 
 enum SqlSupportedResultSetConcurrency {
   SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED = 0;
   SQL_RESULT_SET_CONCURRENCY_READ_ONLY = 1;
   SQL_RESULT_SET_CONCURRENCY_UPDATABLE = 2;
 }
 
 enum SqlSupportsConvert {
   SQL_CONVERT_BIGINT = 0;
   SQL_CONVERT_BINARY = 1;
   SQL_CONVERT_BIT = 2;
   SQL_CONVERT_CHAR = 3;
   SQL_CONVERT_DATE = 4;
   SQL_CONVERT_DECIMAL = 5;
   SQL_CONVERT_FLOAT = 6;
   SQL_CONVERT_INTEGER = 7;
   SQL_CONVERT_INTERVAL_DAY_TIME = 8;
   SQL_CONVERT_INTERVAL_YEAR_MONTH = 9;
   SQL_CONVERT_LONGVARBINARY = 10;
   SQL_CONVERT_LONGVARCHAR = 11;
   SQL_CONVERT_NUMERIC = 12;
   SQL_CONVERT_REAL = 13;
   SQL_CONVERT_SMALLINT = 14;
   SQL_CONVERT_TIME = 15;
   SQL_CONVERT_TIMESTAMP = 16;
   SQL_CONVERT_TINYINT = 17;
   SQL_CONVERT_VARBINARY = 18;
   SQL_CONVERT_VARCHAR = 19;
 }
 
 /**
  * The JDBC/ODBC-defined type of any object.
  * All the values here are the sames as in the JDBC and ODBC specs.
  */
 enum XdbcDataType {
   XDBC_UNKNOWN_TYPE = 0;
   XDBC_CHAR = 1;
   XDBC_NUMERIC = 2;
   XDBC_DECIMAL = 3;
   XDBC_INTEGER = 4;
   XDBC_SMALLINT = 5;
   XDBC_FLOAT = 6;
   XDBC_REAL = 7;
   XDBC_DOUBLE = 8;
   XDBC_DATETIME = 9;
   XDBC_INTERVAL = 10;
   XDBC_VARCHAR = 12;
   XDBC_DATE = 91;
   XDBC_TIME = 92;
   XDBC_TIMESTAMP = 93;
   XDBC_LONGVARCHAR = -1;
   XDBC_BINARY = -2;
   XDBC_VARBINARY = -3;
   XDBC_LONGVARBINARY = -4;
   XDBC_BIGINT = -5;
   XDBC_TINYINT = -6;
   XDBC_BIT = -7;
   XDBC_WCHAR = -8;
   XDBC_WVARCHAR = -9;
 }
 
 /**
  * Detailed subtype information for XDBC_TYPE_DATETIME and XDBC_TYPE_INTERVAL.
  */
 enum XdbcDatetimeSubcode {
   option allow_alias = true;
   XDBC_SUBCODE_UNKNOWN = 0;
   XDBC_SUBCODE_YEAR = 1;
   XDBC_SUBCODE_DATE = 1;
   XDBC_SUBCODE_TIME = 2;
   XDBC_SUBCODE_MONTH = 2;
   XDBC_SUBCODE_TIMESTAMP = 3;
   XDBC_SUBCODE_DAY = 3;
   XDBC_SUBCODE_TIME_WITH_TIMEZONE = 4;
   XDBC_SUBCODE_HOUR = 4;
   XDBC_SUBCODE_TIMESTAMP_WITH_TIMEZONE = 5;
   XDBC_SUBCODE_MINUTE = 5;
   XDBC_SUBCODE_SECOND = 6;
   XDBC_SUBCODE_YEAR_TO_MONTH = 7;
   XDBC_SUBCODE_DAY_TO_HOUR = 8;
   XDBC_SUBCODE_DAY_TO_MINUTE = 9;
   XDBC_SUBCODE_DAY_TO_SECOND = 10;
   XDBC_SUBCODE_HOUR_TO_MINUTE = 11;
   XDBC_SUBCODE_HOUR_TO_SECOND = 12;
   XDBC_SUBCODE_MINUTE_TO_SECOND = 13;
   XDBC_SUBCODE_INTERVAL_YEAR = 101;
   XDBC_SUBCODE_INTERVAL_MONTH = 102;
   XDBC_SUBCODE_INTERVAL_DAY = 103;
   XDBC_SUBCODE_INTERVAL_HOUR = 104;
   XDBC_SUBCODE_INTERVAL_MINUTE = 105;
   XDBC_SUBCODE_INTERVAL_SECOND = 106;
   XDBC_SUBCODE_INTERVAL_YEAR_TO_MONTH = 107;
   XDBC_SUBCODE_INTERVAL_DAY_TO_HOUR = 108;
   XDBC_SUBCODE_INTERVAL_DAY_TO_MINUTE = 109;
   XDBC_SUBCODE_INTERVAL_DAY_TO_SECOND = 110;
   XDBC_SUBCODE_INTERVAL_HOUR_TO_MINUTE = 111;
   XDBC_SUBCODE_INTERVAL_HOUR_TO_SECOND = 112;
   XDBC_SUBCODE_INTERVAL_MINUTE_TO_SECOND = 113;
 }
 
 enum Nullable {
   /**
    * Indicates that the fields does not allow the use of null values.
    */
   NULLABILITY_NO_NULLS = 0;
 
   /**
    * Indicates that the fields allow the use of null values.
    */
   NULLABILITY_NULLABLE = 1;
 
   /**
    * Indicates that nullability of the fields can not be determined.
    */
   NULLABILITY_UNKNOWN = 2;
 }
 
 enum Searchable {
   /**
    * Indicates that column can not be used in a WHERE clause.
    */
   SEARCHABLE_NONE = 0;
 
   /**
    * Indicates that the column can be used in a WHERE clause if it is using a
    * LIKE operator.
    */
   SEARCHABLE_CHAR = 1;
 
   /**
    * Indicates that the column can be used In a WHERE clause with any
    * operator other than LIKE.
    *
    * - Allowed operators: comparison, quantified comparison, BETWEEN,
    *                      DISTINCT, IN, MATCH, and UNIQUE.
    */
   SEARCHABLE_BASIC = 2;
 
   /**
    * Indicates that the column can be used in a WHERE clause using any operator.
    */
   SEARCHABLE_FULL = 3;
 }
 
 /*
  * Represents a request to retrieve information about data type supported on a Flight SQL enabled backend.
  * Used in the command member of FlightDescriptor for the following RPC calls:
  *  - GetSchema: return the schema of the query.
  *  - GetFlightInfo: execute the catalog metadata request.
  *
  * The returned schema will be:
  * <
  *   type_name: utf8 not null (The name of the data type, for example: VARCHAR, INTEGER, etc),
  *   data_type: int32 not null (The SQL data type),
  *   column_size: int32 (The maximum size supported by that column.
  *                       In case of exact numeric types, this represents the maximum precision.
  *                       In case of string types, this represents the character length.
  *                       In case of datetime data types, this represents the length in characters of the string representation.
  *                       NULL is returned for data types where column size is not applicable.),
  *   literal_prefix: utf8 (Character or characters used to prefix a literal, NULL is returned for
  *                         data types where a literal prefix is not applicable.),
  *   literal_suffix: utf8 (Character or characters used to terminate a literal,
  *                         NULL is returned for data types where a literal suffix is not applicable.),
  *   create_params: list<utf8 not null>
  *                        (A list of keywords corresponding to which parameters can be used when creating
  *                         a column for that specific type.
  *                         NULL is returned if there are no parameters for the data type definition.),
  *   nullable: int32 not null (Shows if the data type accepts a NULL value. The possible values can be seen in the
  *                             Nullable enum.),
  *   case_sensitive: bool not null (Shows if a character data type is case-sensitive in collations and comparisons),
  *   searchable: int32 not null (Shows how the data type is used in a WHERE clause. The possible values can be seen in the
  *                               Searchable enum.),
  *   unsigned_attribute: bool (Shows if the data type is unsigned. NULL is returned if the attribute is
  *                             not applicable to the data type or the data type is not numeric.),
  *   fixed_prec_scale: bool not null (Shows if the data type has predefined fixed precision and scale.),
  *   auto_increment: bool (Shows if the data type is auto incremental. NULL is returned if the attribute
  *                         is not applicable to the data type or the data type is not numeric.),
  *   local_type_name: utf8 (Localized version of the data source-dependent name of the data type. NULL
  *                          is returned if a localized name is not supported by the data source),
  *   minimum_scale: int32 (The minimum scale of the data type on the data source.
  *                         If a data type has a fixed scale, the MINIMUM_SCALE and MAXIMUM_SCALE
  *                         columns both contain this value. NULL is returned if scale is not applicable.),
  *   maximum_scale: int32 (The maximum scale of the data type on the data source.
  *                         NULL is returned if scale is not applicable.),
  *   sql_data_type: int32 not null (The value of the SQL DATA TYPE which has the same values
  *                                  as data_type value. Except for interval and datetime, which
  *                                  uses generic values. More info about those types can be
  *                                  obtained through datetime_subcode. The possible values can be seen
  *                                  in the XdbcDataType enum.),
  *   datetime_subcode: int32 (Only used when the SQL DATA TYPE is interval or datetime. It contains
  *                            its sub types. For type different from interval and datetime, this value
  *                            is NULL. The possible values can be seen in the XdbcDatetimeSubcode enum.),
  *   num_prec_radix: int32 (If the data type is an approximate numeric type, this column contains
  *                          the value 2 to indicate that COLUMN_SIZE specifies a number of bits. For
  *                          exact numeric types, this column contains the value 10 to indicate that
  *                          column size specifies a number of decimal digits. Otherwise, this column is NULL.),
  *   interval_precision: int32 (If the data type is an interval data type, then this column contains the value
  *                              of the interval leading precision. Otherwise, this column is NULL. This fields
  *                              is only relevant to be used by ODBC).
  * >
  * The returned data should be ordered by data_type and then by type_name.
  */
 message CommandGetXdbcTypeInfo {
   option (experimental) = true;
 
   /*
    * Specifies the data type to search for the info.
    */
   optional int32 data_type = 1;
 }
 
 /*
  * Represents a request to retrieve the list of catalogs on a Flight SQL enabled backend.
  * The definition of a catalog depends on vendor/implementation. It is usually the database itself
  * Used in the command member of FlightDescriptor for the following RPC calls:
  *  - GetSchema: return the Arrow schema of the query.
  *  - GetFlightInfo: execute the catalog metadata request.
  *
  * The returned Arrow schema will be:
  * <
  *  catalog_name: utf8 not null
  * >
  * The returned data should be ordered by catalog_name.
  */
 message CommandGetCatalogs {
   option (experimental) = true;
 }
 
 /*
  * Represents a request to retrieve the list of database schemas on a Flight SQL enabled backend.
  * The definition of a database schema depends on vendor/implementation. It is usually a collection of tables.
  * Used in the command member of FlightDescriptor for the following RPC calls:
  *  - GetSchema: return the Arrow schema of the query.
  *  - GetFlightInfo: execute the catalog metadata request.
  *
  * The returned Arrow schema will be:
  * <
  *  catalog_name: utf8,
  *  db_schema_name: utf8 not null
  * >
  * The returned data should be ordered by catalog_name, then db_schema_name.
  */
 message CommandGetDbSchemas {
   option (experimental) = true;
 
   /*
    * Specifies the Catalog to search for the tables.
    * An empty string retrieves those without a catalog.
    * If omitted the catalog name should not be used to narrow the search.
    */
   optional string catalog = 1;
 
   /*
    * Specifies a filter pattern for schemas to search for.
    * When no db_schema_filter_pattern is provided, the pattern will not be used to narrow the search.
    * In the pattern string, two special characters can be used to denote matching rules:
    *    - "%" means to match any substring with 0 or more characters.
    *    - "_" means to match any one character.
    */
   optional string db_schema_filter_pattern = 2;
 }
 
 /*
  * Represents a request to retrieve the list of tables, and optionally their schemas, on a Flight SQL enabled backend.
  * Used in the command member of FlightDescriptor for the following RPC calls:
  *  - GetSchema: return the Arrow schema of the query.
  *  - GetFlightInfo: execute the catalog metadata request.
  *
  * The returned Arrow schema will be:
  * <
  *  catalog_name: utf8,
  *  db_schema_name: utf8,
  *  table_name: utf8 not null,
  *  table_type: utf8 not null,
  *  [optional] table_schema: bytes not null (schema of the table as described in Schema.fbs::Schema,
  *                                           it is serialized as an IPC message.)
  * >
  * Fields on table_schema may contain the following metadata:
  *  - ARROW:FLIGHT:SQL:CATALOG_NAME      - Table's catalog name
  *  - ARROW:FLIGHT:SQL:DB_SCHEMA_NAME    - Database schema name
  *  - ARROW:FLIGHT:SQL:TABLE_NAME        - Table name
  *  - ARROW:FLIGHT:SQL:TYPE_NAME         - The data source-specific name for the data type of the column.
  *  - ARROW:FLIGHT:SQL:PRECISION         - Column precision/size
  *  - ARROW:FLIGHT:SQL:SCALE             - Column scale/decimal digits if applicable
  *  - ARROW:FLIGHT:SQL:IS_AUTO_INCREMENT - "1" indicates if the column is auto incremented, "0" otherwise.
  *  - ARROW:FLIGHT:SQL:IS_CASE_SENSITIVE - "1" indicates if the column is case sensitive, "0" otherwise.
  *  - ARROW:FLIGHT:SQL:IS_READ_ONLY      - "1" indicates if the column is read only, "0" otherwise.
  *  - ARROW:FLIGHT:SQL:IS_SEARCHABLE     - "1" indicates if the column is searchable via WHERE clause, "0" otherwise.
  * The returned data should be ordered by catalog_name, db_schema_name, table_name, then table_type, followed by table_schema if requested.
  */
 message CommandGetTables {
   option (experimental) = true;
 
   /*
    * Specifies the Catalog to search for the tables.
    * An empty string retrieves those without a catalog.
    * If omitted the catalog name should not be used to narrow the search.
    */
   optional string catalog = 1;
 
   /*
    * Specifies a filter pattern for schemas to search for.
    * When no db_schema_filter_pattern is provided, all schemas matching other filters are searched.
    * In the pattern string, two special characters can be used to denote matching rules:
    *    - "%" means to match any substring with 0 or more characters.
    *    - "_" means to match any one character.
    */
   optional string db_schema_filter_pattern = 2;
 
   /*
    * Specifies a filter pattern for tables to search for.
    * When no table_name_filter_pattern is provided, all tables matching other filters are searched.
    * In the pattern string, two special characters can be used to denote matching rules:
    *    - "%" means to match any substring with 0 or more characters.
    *    - "_" means to match any one character.
    */
   optional string table_name_filter_pattern = 3;
 
   /*
    * Specifies a filter of table types which must match.
    * The table types depend on vendor/implementation. It is usually used to separate tables from views or system tables.
    * TABLE, VIEW, and SYSTEM TABLE are commonly supported.
    */
   repeated string table_types = 4;
 
   // Specifies if the Arrow schema should be returned for found tables.
   bool include_schema = 5;
 }
 
 /*
  * Represents a request to retrieve the list of table types on a Flight SQL enabled backend.
  * The table types depend on vendor/implementation. It is usually used to separate tables from views or system tables.
  * TABLE, VIEW, and SYSTEM TABLE are commonly supported.
  * Used in the command member of FlightDescriptor for the following RPC calls:
  *  - GetSchema: return the Arrow schema of the query.
  *  - GetFlightInfo: execute the catalog metadata request.
  *
  * The returned Arrow schema will be:
  * <
  *  table_type: utf8 not null
  * >
  * The returned data should be ordered by table_type.
  */
 message CommandGetTableTypes {
   option (experimental) = true;
 }
 
 /*
  * Represents a request to retrieve the primary keys of a table on a Flight SQL enabled backend.
  * Used in the command member of FlightDescriptor for the following RPC calls:
  *  - GetSchema: return the Arrow schema of the query.
  *  - GetFlightInfo: execute the catalog metadata request.
  *
  * The returned Arrow schema will be:
  * <
  *  catalog_name: utf8,
  *  db_schema_name: utf8,
  *  table_name: utf8 not null,
  *  column_name: utf8 not null,
  *  key_name: utf8,
  *  key_sequence: int32 not null
  * >
  * The returned data should be ordered by catalog_name, db_schema_name, table_name, key_name, then key_sequence.
  */
 message CommandGetPrimaryKeys {
   option (experimental) = true;
 
   /*
    * Specifies the catalog to search for the table.
    * An empty string retrieves those without a catalog.
    * If omitted the catalog name should not be used to narrow the search.
    */
   optional string catalog = 1;
 
   /*
    * Specifies the schema to search for the table.
    * An empty string retrieves those without a schema.
    * If omitted the schema name should not be used to narrow the search.
    */
   optional string db_schema = 2;
 
   // Specifies the table to get the primary keys for.
   string table = 3;
 }
 
 enum UpdateDeleteRules {
   CASCADE = 0;
   RESTRICT = 1;
   SET_NULL = 2;
   NO_ACTION = 3;
   SET_DEFAULT = 4;
 }
 
 /*
  * Represents a request to retrieve a description of the foreign key columns that reference the given table's
  * primary key columns (the foreign keys exported by a table) of a table on a Flight SQL enabled backend.
  * Used in the command member of FlightDescriptor for the following RPC calls:
  *  - GetSchema: return the Arrow schema of the query.
  *  - GetFlightInfo: execute the catalog metadata request.
  *
  * The returned Arrow schema will be:
  * <
  *  pk_catalog_name: utf8,
  *  pk_db_schema_name: utf8,
  *  pk_table_name: utf8 not null,
  *  pk_column_name: utf8 not null,
  *  fk_catalog_name: utf8,
  *  fk_db_schema_name: utf8,
  *  fk_table_name: utf8 not null,
  *  fk_column_name: utf8 not null,
  *  key_sequence: int32 not null,
  *  fk_key_name: utf8,
  *  pk_key_name: utf8,
  *  update_rule: uint8 not null,
  *  delete_rule: uint8 not null
  * >
  * The returned data should be ordered by fk_catalog_name, fk_db_schema_name, fk_table_name, fk_key_name, then key_sequence.
  * update_rule and delete_rule returns a byte that is equivalent to actions declared on UpdateDeleteRules enum.
  */
 message CommandGetExportedKeys {
   option (experimental) = true;
 
   /*
    * Specifies the catalog to search for the foreign key table.
    * An empty string retrieves those without a catalog.
    * If omitted the catalog name should not be used to narrow the search.
    */
   optional string catalog = 1;
 
   /*
    * Specifies the schema to search for the foreign key table.
    * An empty string retrieves those without a schema.
    * If omitted the schema name should not be used to narrow the search.
    */
   optional string db_schema = 2;
 
   // Specifies the foreign key table to get the foreign keys for.
   string table = 3;
 }
 
 /*
  * Represents a request to retrieve the foreign keys of a table on a Flight SQL enabled backend.
  * Used in the command member of FlightDescriptor for the following RPC calls:
  *  - GetSchema: return the Arrow schema of the query.
  *  - GetFlightInfo: execute the catalog metadata request.
  *
  * The returned Arrow schema will be:
  * <
  *  pk_catalog_name: utf8,
  *  pk_db_schema_name: utf8,
  *  pk_table_name: utf8 not null,
  *  pk_column_name: utf8 not null,
  *  fk_catalog_name: utf8,
  *  fk_db_schema_name: utf8,
  *  fk_table_name: utf8 not null,
  *  fk_column_name: utf8 not null,
  *  key_sequence: int32 not null,
  *  fk_key_name: utf8,
  *  pk_key_name: utf8,
  *  update_rule: uint8 not null,
  *  delete_rule: uint8 not null
  * >
  * The returned data should be ordered by pk_catalog_name, pk_db_schema_name, pk_table_name, pk_key_name, then key_sequence.
  * update_rule and delete_rule returns a byte that is equivalent to actions:
  *    - 0 = CASCADE
  *    - 1 = RESTRICT
  *    - 2 = SET NULL
  *    - 3 = NO ACTION
  *    - 4 = SET DEFAULT
  */
 message CommandGetImportedKeys {
   option (experimental) = true;
 
   /*
    * Specifies the catalog to search for the primary key table.
    * An empty string retrieves those without a catalog.
    * If omitted the catalog name should not be used to narrow the search.
    */
   optional string catalog = 1;
 
   /*
    * Specifies the schema to search for the primary key table.
    * An empty string retrieves those without a schema.
    * If omitted the schema name should not be used to narrow the search.
    */
   optional string db_schema = 2;
 
   // Specifies the primary key table to get the foreign keys for.
   string table = 3;
 }
 
 /*
  * Represents a request to retrieve a description of the foreign key columns in the given foreign key table that
  * reference the primary key or the columns representing a unique constraint of the parent table (could be the same
  * or a different table) on a Flight SQL enabled backend.
  * Used in the command member of FlightDescriptor for the following RPC calls:
  *  - GetSchema: return the Arrow schema of the query.
  *  - GetFlightInfo: execute the catalog metadata request.
  *
  * The returned Arrow schema will be:
  * <
  *  pk_catalog_name: utf8,
  *  pk_db_schema_name: utf8,
  *  pk_table_name: utf8 not null,
  *  pk_column_name: utf8 not null,
  *  fk_catalog_name: utf8,
  *  fk_db_schema_name: utf8,
  *  fk_table_name: utf8 not null,
  *  fk_column_name: utf8 not null,
  *  key_sequence: int32 not null,
  *  fk_key_name: utf8,
  *  pk_key_name: utf8,
  *  update_rule: uint8 not null,
  *  delete_rule: uint8 not null
  * >
  * The returned data should be ordered by pk_catalog_name, pk_db_schema_name, pk_table_name, pk_key_name, then key_sequence.
  * update_rule and delete_rule returns a byte that is equivalent to actions:
  *    - 0 = CASCADE
  *    - 1 = RESTRICT
  *    - 2 = SET NULL
  *    - 3 = NO ACTION
  *    - 4 = SET DEFAULT
  */
 message CommandGetCrossReference {
   option (experimental) = true;
 
   /**
    * The catalog name where the parent table is.
    * An empty string retrieves those without a catalog.
    * If omitted the catalog name should not be used to narrow the search.
    */
   optional string pk_catalog = 1;
 
   /**
    * The Schema name where the parent table is.
    * An empty string retrieves those without a schema.
    * If omitted the schema name should not be used to narrow the search.
    */
   optional string pk_db_schema = 2;
 
   /**
    * The parent table name. It cannot be null.
    */
   string pk_table = 3;
 
   /**
    * The catalog name where the foreign table is.
    * An empty string retrieves those without a catalog.
    * If omitted the catalog name should not be used to narrow the search.
    */
   optional string fk_catalog = 4;
 
   /**
    * The schema name where the foreign table is.
    * An empty string retrieves those without a schema.
    * If omitted the schema name should not be used to narrow the search.
    */
   optional string fk_db_schema = 5;
 
   /**
    * The foreign table name. It cannot be null.
    */
   string fk_table = 6;
 }
 
 // Query Execution Action Messages
 
 /*
  * Request message for the "CreatePreparedStatement" action on a Flight SQL enabled backend.
  */
 message ActionCreatePreparedStatementRequest {
   option (experimental) = true;
 
   // The valid SQL string to create a prepared statement for.
   string query = 1;
   // Create/execute the prepared statement as part of this transaction (if
   // unset, executions of the prepared statement will be auto-committed).
   optional bytes transaction_id = 2;
 }
 
 /*
  * An embedded message describing a Substrait plan to execute.
  */
 message SubstraitPlan {
   option (experimental) = true;
 
   // The serialized substrait.Plan to create a prepared statement for.
   // XXX(ARROW-16902): this is bytes instead of an embedded message
   // because Protobuf does not really support one DLL using Protobuf
   // definitions from another DLL.
   bytes plan = 1;
   // The Substrait release, e.g. "0.12.0". This information is not
   // tracked in the plan itself, so this is the only way for consumers
   // to potentially know if they can handle the plan.
   string version = 2;
 }
 
 /*
  * Request message for the "CreatePreparedSubstraitPlan" action on a Flight SQL enabled backend.
  */
 message ActionCreatePreparedSubstraitPlanRequest {
   option (experimental) = true;
 
   // The serialized substrait.Plan to create a prepared statement for.
   SubstraitPlan plan = 1;
   // Create/execute the prepared statement as part of this transaction (if
   // unset, executions of the prepared statement will be auto-committed).
   optional bytes transaction_id = 2;
 }
 
 /*
  * Wrap the result of a "CreatePreparedStatement" or "CreatePreparedSubstraitPlan" action.
  *
  * The resultant PreparedStatement can be closed either:
  * - Manually, through the "ClosePreparedStatement" action;
  * - Automatically, by a server timeout.
  *
  * The result should be wrapped in a google.protobuf.Any message.
  */
 message ActionCreatePreparedStatementResult {
   option (experimental) = true;
 
   // Opaque handle for the prepared statement on the server.
   bytes prepared_statement_handle = 1;
 
   // If a result set generating query was provided, dataset_schema contains the
   // schema of the dataset as described in Schema.fbs::Schema, it is serialized as an IPC message.
   bytes dataset_schema = 2;
 
   // If the query provided contained parameters, parameter_schema contains the
   // schema of the expected parameters as described in Schema.fbs::Schema, it is serialized as an IPC message.
   bytes parameter_schema = 3;
 }
 
 /*
  * Request message for the "ClosePreparedStatement" action on a Flight SQL enabled backend.
  * Closes server resources associated with the prepared statement handle.
  */
 message ActionClosePreparedStatementRequest {
   option (experimental) = true;
 
   // Opaque handle for the prepared statement on the server.
   bytes prepared_statement_handle = 1;
 }
 
 /*
  * Request message for the "BeginTransaction" action.
  * Begins a transaction.
  */
 message ActionBeginTransactionRequest {
   option (experimental) = true;
 }
 
 /*
  * Request message for the "BeginSavepoint" action.
  * Creates a savepoint within a transaction.
  *
  * Only supported if FLIGHT_SQL_TRANSACTION is
  * FLIGHT_SQL_TRANSACTION_SUPPORT_SAVEPOINT.
  */
 message ActionBeginSavepointRequest {
   option (experimental) = true;
 
   // The transaction to which a savepoint belongs.
   bytes transaction_id = 1;
   // Name for the savepoint.
   string name = 2;
 }
 
 /*
  * The result of a "BeginTransaction" action.
  *
  * The transaction can be manipulated with the "EndTransaction" action, or
  * automatically via server timeout. If the transaction times out, then it is
  * automatically rolled back.
  *
  * The result should be wrapped in a google.protobuf.Any message.
  */
 message ActionBeginTransactionResult {
   option (experimental) = true;
 
   // Opaque handle for the transaction on the server.
   bytes transaction_id = 1;
 }
 
 /*
  * The result of a "BeginSavepoint" action.
  *
  * The transaction can be manipulated with the "EndSavepoint" action.
  * If the associated transaction is committed, rolled back, or times
  * out, then the savepoint is also invalidated.
  *
  * The result should be wrapped in a google.protobuf.Any message.
  */
 message ActionBeginSavepointResult {
   option (experimental) = true;
 
   // Opaque handle for the savepoint on the server.
   bytes savepoint_id = 1;
 }
 
 /*
  * Request message for the "EndTransaction" action.
  *
  * Commit (COMMIT) or rollback (ROLLBACK) the transaction.
  *
  * If the action completes successfully, the transaction handle is
  * invalidated, as are all associated savepoints.
  */
 message ActionEndTransactionRequest {
   option (experimental) = true;
 
   enum EndTransaction {
     END_TRANSACTION_UNSPECIFIED = 0;
     // Commit the transaction.
     END_TRANSACTION_COMMIT = 1;
     // Roll back the transaction.
     END_TRANSACTION_ROLLBACK = 2;
   }
   // Opaque handle for the transaction on the server.
   bytes transaction_id = 1;
   // Whether to commit/rollback the given transaction.
   EndTransaction action = 2;
 }
 
 /*
  * Request message for the "EndSavepoint" action.
  *
  * Release (RELEASE) the savepoint or rollback (ROLLBACK) to the
  * savepoint.
  *
  * Releasing a savepoint invalidates that savepoint.  Rolling back to
  * a savepoint does not invalidate the savepoint, but invalidates all
  * savepoints created after the current savepoint.
  */
 message ActionEndSavepointRequest {
   option (experimental) = true;
 
   enum EndSavepoint {
     END_SAVEPOINT_UNSPECIFIED = 0;
     // Release the savepoint.
     END_SAVEPOINT_RELEASE = 1;
     // Roll back to a savepoint.
     END_SAVEPOINT_ROLLBACK = 2;
   }
   // Opaque handle for the savepoint on the server.
   bytes savepoint_id = 1;
   // Whether to rollback/release the given savepoint.
   EndSavepoint action = 2;
 }
 
 // Query Execution Messages.
 
 /*
  * Represents a SQL query. Used in the command member of FlightDescriptor
  * for the following RPC calls:
  *  - GetSchema: return the Arrow schema of the query.
  *    Fields on this schema may contain the following metadata:
  *    - ARROW:FLIGHT:SQL:CATALOG_NAME      - Table's catalog name
  *    - ARROW:FLIGHT:SQL:DB_SCHEMA_NAME    - Database schema name
  *    - ARROW:FLIGHT:SQL:TABLE_NAME        - Table name
  *    - ARROW:FLIGHT:SQL:TYPE_NAME         - The data source-specific name for the data type of the column.
  *    - ARROW:FLIGHT:SQL:PRECISION         - Column precision/size
  *    - ARROW:FLIGHT:SQL:SCALE             - Column scale/decimal digits if applicable
  *    - ARROW:FLIGHT:SQL:IS_AUTO_INCREMENT - "1" indicates if the column is auto incremented, "0" otherwise.
  *    - ARROW:FLIGHT:SQL:IS_CASE_SENSITIVE - "1" indicates if the column is case sensitive, "0" otherwise.
  *    - ARROW:FLIGHT:SQL:IS_READ_ONLY      - "1" indicates if the column is read only, "0" otherwise.
  *    - ARROW:FLIGHT:SQL:IS_SEARCHABLE     - "1" indicates if the column is searchable via WHERE clause, "0" otherwise.
  *  - GetFlightInfo: execute the query.
  */
 message CommandStatementQuery {
   option (experimental) = true;
 
   // The SQL syntax.
   string query = 1;
   // Include the query as part of this transaction (if unset, the query is auto-committed).
   optional bytes transaction_id = 2;
 }
 
 /*
  * Represents a Substrait plan. Used in the command member of FlightDescriptor
  * for the following RPC calls:
  *  - GetSchema: return the Arrow schema of the query.
  *    Fields on this schema may contain the following metadata:
  *    - ARROW:FLIGHT:SQL:CATALOG_NAME      - Table's catalog name
  *    - ARROW:FLIGHT:SQL:DB_SCHEMA_NAME    - Database schema name
  *    - ARROW:FLIGHT:SQL:TABLE_NAME        - Table name
  *    - ARROW:FLIGHT:SQL:TYPE_NAME         - The data source-specific name for the data type of the column.
  *    - ARROW:FLIGHT:SQL:PRECISION         - Column precision/size
  *    - ARROW:FLIGHT:SQL:SCALE             - Column scale/decimal digits if applicable
  *    - ARROW:FLIGHT:SQL:IS_AUTO_INCREMENT - "1" indicates if the column is auto incremented, "0" otherwise.
  *    - ARROW:FLIGHT:SQL:IS_CASE_SENSITIVE - "1" indicates if the column is case sensitive, "0" otherwise.
  *    - ARROW:FLIGHT:SQL:IS_READ_ONLY      - "1" indicates if the column is read only, "0" otherwise.
  *    - ARROW:FLIGHT:SQL:IS_SEARCHABLE     - "1" indicates if the column is searchable via WHERE clause, "0" otherwise.
  *  - GetFlightInfo: execute the query.
  *  - DoPut: execute the query.
  */
 message CommandStatementSubstraitPlan {
   option (experimental) = true;
 
   // A serialized substrait.Plan
   SubstraitPlan plan = 1;
   // Include the query as part of this transaction (if unset, the query is auto-committed).
   optional bytes transaction_id = 2;
 }
 
 /**
  * Represents a ticket resulting from GetFlightInfo with a CommandStatementQuery.
  * This should be used only once and treated as an opaque value, that is, clients should not attempt to parse this.
  */
 message TicketStatementQuery {
   option (experimental) = true;
 
   // Unique identifier for the instance of the statement to execute.
   bytes statement_handle = 1;
 }
 
 /*
  * Represents an instance of executing a prepared statement. Used in the command member of FlightDescriptor for
  * the following RPC calls:
  *  - GetSchema: return the Arrow schema of the query.
  *    Fields on this schema may contain the following metadata:
  *    - ARROW:FLIGHT:SQL:CATALOG_NAME      - Table's catalog name
  *    - ARROW:FLIGHT:SQL:DB_SCHEMA_NAME    - Database schema name
  *    - ARROW:FLIGHT:SQL:TABLE_NAME        - Table name
  *    - ARROW:FLIGHT:SQL:TYPE_NAME         - The data source-specific name for the data type of the column.
  *    - ARROW:FLIGHT:SQL:PRECISION         - Column precision/size
  *    - ARROW:FLIGHT:SQL:SCALE             - Column scale/decimal digits if applicable
  *    - ARROW:FLIGHT:SQL:IS_AUTO_INCREMENT - "1" indicates if the column is auto incremented, "0" otherwise.
  *    - ARROW:FLIGHT:SQL:IS_CASE_SENSITIVE - "1" indicates if the column is case sensitive, "0" otherwise.
  *    - ARROW:FLIGHT:SQL:IS_READ_ONLY      - "1" indicates if the column is read only, "0" otherwise.
  *    - ARROW:FLIGHT:SQL:IS_SEARCHABLE     - "1" indicates if the column is searchable via WHERE clause, "0" otherwise.
  *  - DoPut: bind parameter values. All of the bound parameter sets will be executed as a single atomic execution.
  *  - GetFlightInfo: execute the prepared statement instance.
  */
 message CommandPreparedStatementQuery {
   option (experimental) = true;
 
   // Opaque handle for the prepared statement on the server.
   bytes prepared_statement_handle = 1;
 }
 
 /*
  * Represents a SQL update query. Used in the command member of FlightDescriptor
  * for the the RPC call DoPut to cause the server to execute the included SQL update.
  */
 message CommandStatementUpdate {
   option (experimental) = true;
 
   // The SQL syntax.
   string query = 1;
   // Include the query as part of this transaction (if unset, the query is auto-committed).
   optional bytes transaction_id = 2;
 }
 
 /*
  * Represents a SQL update query. Used in the command member of FlightDescriptor
  * for the the RPC call DoPut to cause the server to execute the included
  * prepared statement handle as an update.
  */
 message CommandPreparedStatementUpdate {
   option (experimental) = true;
 
   // Opaque handle for the prepared statement on the server.
   bytes prepared_statement_handle = 1;
 }
 
 /*
  * Returned from the RPC call DoPut when a CommandStatementUpdate
  * CommandPreparedStatementUpdate was in the request, containing
  * results from the update.
  */
 message DoPutUpdateResult {
   option (experimental) = true;
 
   // The number of records updated. A return value of -1 represents
   // an unknown updated record count.
   int64 record_count = 1;
 }
 
 /*
  * Request message for the "CancelQuery" action.
  *
  * Explicitly cancel a running query.
  *
  * This lets a single client explicitly cancel work, no matter how many clients
  * are involved/whether the query is distributed or not, given server support.
  * The transaction/statement is not rolled back; it is the application's job to
  * commit or rollback as appropriate. This only indicates the client no longer
  * wishes to read the remainder of the query results or continue submitting
  * data.
  *
  * This command is idempotent.
  */
 message ActionCancelQueryRequest {
   option (experimental) = true;
 
   // The result of the GetFlightInfo RPC that initiated the query.
   // XXX(ARROW-16902): this must be a serialized FlightInfo, but is
   // rendered as bytes because Protobuf does not really support one
   // DLL using Protobuf definitions from another DLL.
   bytes info = 1;
 }
 
 /*
  * The result of cancelling a query.
  *
  * The result should be wrapped in a google.protobuf.Any message.
  */
 message ActionCancelQueryResult {
   option (experimental) = true;
 
   enum CancelResult {
     // The cancellation status is unknown. Servers should avoid using
     // this value (send a NOT_FOUND error if the requested query is
     // not known). Clients can retry the request.
     CANCEL_RESULT_UNSPECIFIED = 0;
     // The cancellation request is complete. Subsequent requests with
     // the same payload may return CANCELLED or a NOT_FOUND error.
     CANCEL_RESULT_CANCELLED = 1;
     // The cancellation request is in progress. The client may retry
     // the cancellation request.
     CANCEL_RESULT_CANCELLING = 2;
     // The query is not cancellable. The client should not retry the
     // cancellation request.
     CANCEL_RESULT_NOT_CANCELLABLE = 3;
   }
 
   CancelResult result = 1;
 }
 
 extend google.protobuf.MessageOptions {
   bool experimental = 1000;
 }