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| <!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
| <concept id="glossary"> |
| |
| <title>Impala Glossary</title> |
| <prolog> |
| <metadata> |
| <data name="Category" value="Impala"/> |
| <data name="Category" value="Administrators"/> |
| <data name="Category" value="Developers"/> |
| <data name="Category" value="Data Analysts"/> |
| </metadata> |
| </prolog> |
| |
| <conbody> |
| |
| <section id="glos_ddl"> |
| |
| <title>DDL</title> |
| |
| <p> |
| A category of SQL statements involving administrative or metadata-related operations. Many of these |
| statements start with the keywords <codeph>CREATE</codeph>, <codeph>ALTER</codeph>, or |
| <codeph>DROP</codeph>. Contrast with DML. |
| </p> |
| </section> |
| |
| <section id="glos_dml"> |
| |
| <title>DML</title> |
| |
| <p> |
| A category of SQL statements that modify table data. Impala has a limited set of DML statements, primarily |
| the <codeph>INSERT</codeph> statement. Contrast with DDL. |
| </p> |
| </section> |
| |
| <section id="glos_catalog"> |
| |
| <title>catalog</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_catalogd"> |
| |
| <title>catalogd</title> |
| |
| <p> |
| A daemon. |
| </p> |
| </section> |
| |
| <section id="glos_impalad"> |
| |
| <title>impalad</title> |
| |
| <p> |
| A daemon. |
| </p> |
| </section> |
| |
| <section id="glos_statestored"> |
| |
| <title>statestored</title> |
| |
| <p> |
| A daemon. |
| </p> |
| </section> |
| |
| <section id="glos_statestore"> |
| |
| <title>statestore</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_metastore"> |
| |
| <title>metastore</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_table"> |
| |
| <title>table</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_database"> |
| |
| <title>database</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_hive"> |
| |
| <title>Hive</title> |
| |
| <p> |
| Its full trademarked name is Apache Hive. |
| </p> |
| </section> |
| |
| <section id="glos_hbase"> |
| |
| <title>HBase</title> |
| |
| <p> |
| Its full trademarked name is Apache HBase. |
| </p> |
| </section> |
| |
| <section id="glos_coordinator_node"> |
| |
| <title>coordinator node</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_sql"> |
| |
| <title>SQL</title> |
| |
| <p> |
| An acronym for Structured Query Language, the industry standard language for database operations. |
| Implemented by components such as Impala and Hive. |
| </p> |
| </section> |
| |
| <section id="glos_avro"> |
| |
| <title>Avro</title> |
| |
| <p> |
| A file format. |
| </p> |
| </section> |
| |
| <section id="glos_text"> |
| |
| <title>text</title> |
| |
| <p> |
| A file format. |
| </p> |
| </section> |
| |
| <section id="glos_hdfs"> |
| |
| <title>HDFS</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_block"> |
| |
| <title>block</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_parquet"> |
| |
| <title>Parquet</title> |
| |
| <p> |
| A file format. |
| </p> |
| </section> |
| |
| <section id="glos_rcfile"> |
| |
| <title>RCFile</title> |
| |
| <p> |
| A file format. |
| </p> |
| </section> |
| |
| <section id="glos_sequencefile"> |
| |
| <title>SequenceFile</title> |
| |
| <p> |
| A file format. |
| </p> |
| </section> |
| |
| <section id="glos_snappy"> |
| |
| <title>Snappy</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_file_format"> |
| |
| <title>file format</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_compression"> |
| |
| <title>compression</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_codec"> |
| |
| <title>codec</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_lzo"> |
| |
| <title>LZO</title> |
| |
| <p> |
| A compression codec. |
| </p> |
| </section> |
| |
| <section id="glos_gzip"> |
| |
| <title>gzip</title> |
| |
| <p> |
| A compression codec. |
| </p> |
| </section> |
| |
| <section id="glos_bzip2"> |
| |
| <title>BZip2</title> |
| |
| <p> |
| A compression codec. |
| </p> |
| </section> |
| |
| <section id="glos_sentry"> |
| |
| <title/> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_authorization"> |
| |
| <title>authorization</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_authentication"> |
| |
| <title>authentication</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_delegation"> |
| |
| <title>delegation</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_skew"> |
| |
| <title>skew</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_profile"> |
| |
| <title>profile</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_query"> |
| |
| <title>query</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_external_table"> |
| |
| <title>external table</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_internal_table"> |
| |
| <title>internal table</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_view"> |
| |
| <title>view</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_function"> |
| |
| <title>function</title> |
| |
| <p> |
| In Impala, a kind of database object that performs customized processing or business logic. The kinds of |
| functions include built-in functions, UDFs, and UDAs. |
| </p> |
| </section> |
| |
| <section id="glos_udf"> |
| |
| <title>UDF</title> |
| |
| <p> |
| Acronym for user-defined function. In Impala, a function that you write in C++ or Java. A UDF (as opposed |
| to a UDA) returns a single scalar value for each row evaluated in the result set. On occasion, UDF is used |
| in a broad context to include all kinds of user-written functions, including UDAs. |
| </p> |
| </section> |
| |
| <section id="glos_uda"> |
| |
| <title>UDA</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_aggregate_function"> |
| |
| <title>aggregate function</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_built_in_function"> |
| |
| <title>built-in function</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_analytic_function"> |
| |
| <title>analytic function</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_admission_control"> |
| |
| <title>admission control</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_llama"> |
| |
| <title>llama</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_impala"> |
| |
| <title>Impala</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_table_statistics"> |
| |
| <title>table statistics</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_column_statistics"> |
| |
| <title>column statistics</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_statistics"> |
| |
| <title>statistics</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_incremental_statistics"> |
| |
| <title>incremental statistics</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_hdfs_caching"> |
| |
| <title>HDFS caching</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_join_query"> |
| |
| <title>join query</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_straight_join"> |
| |
| <title>straight join</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_inner_join"> |
| |
| <title>inner join</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_outer_join"> |
| |
| <title>outer join</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_left_join"> |
| |
| <title>left join</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_right_join"> |
| |
| <title>right join</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_equijoin"> |
| |
| <title>equijoin</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_antijoin"> |
| |
| <title>antijoin</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_semijoin"> |
| |
| <title>semijoin</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_cross_join"> |
| |
| <title>cross join</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_hint"> |
| |
| <title>hint</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_distinct"> |
| |
| <title>distinct</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_impala_shell"> |
| |
| <title>impala-shell</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_odbc"> |
| |
| <title>ODBC</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_jdbc"> |
| |
| <title>JDBC</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_data_types"> |
| |
| <title>data types</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_performance"> |
| |
| <title>performance</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_scalability"> |
| |
| <title>scalability</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_hue"> |
| |
| <title>Hue</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_partition"> |
| |
| <title>partition</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_partitioning"> |
| |
| <title>partitioning</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_partitioned_table"> |
| |
| <title>partitioned table</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_hdfs_trashcan"> |
| |
| <title>HDFS trashcan</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_explain_plan"> |
| |
| <title>EXPLAIN plan</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_summary"> |
| |
| <title>summary</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_executive_summary"> |
| |
| <title>executive summary</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_alias"> |
| |
| <title>alias</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_identifier"> |
| |
| <title>identifier</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_query_option"> |
| |
| <title>query option</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_daemon"> |
| |
| <title>daemon</title> |
| |
| <p> |
| The daemons that make up the Impala service are <cmdname>impalad</cmdname>, <cmdname>statestored</cmdname>, |
| and <cmdname>catalogd</cmdname>. |
| </p> |
| </section> |
| |
| <section id="impala_service"> |
| |
| <title>Impala service</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_session"> |
| |
| <title>session</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_schema"> |
| |
| <title>schema</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_schema_evolution"> |
| |
| <title>schema evolution</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_literal"> |
| |
| <title>literal</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_string"> |
| |
| <title>string</title> |
| |
| <p> |
| String values are represented in Impala by the data types <codeph>STRING</codeph>, |
| <codeph>VARCHAR</codeph>, and <codeph>CHAR</codeph>. |
| </p> |
| </section> |
| |
| <section id="glos_number"> |
| |
| <title>number</title> |
| |
| <p> |
| Numeric values are represented in Impala by the data types <codeph>INT</codeph>, <codeph>BIGINT</codeph>, |
| <codeph>SMALLINT</codeph>, <codeph>TINYINT</codeph>, <codeph>DECIMAL</codeph>, <codeph>DOUBLE</codeph>, and |
| <codeph>FLOAT</codeph>. |
| </p> |
| </section> |
| |
| <section id="glos_date_time"> |
| |
| <title>date/time</title> |
| |
| <p> |
| Date and time values are represented in Impala by the <codeph>TIMESTAMP</codeph> data type. Sometimes, for |
| convenience or as part of a partitioning plan, dates are represented as formatted <codeph>STRING</codeph> |
| columns or as separate integer columns for year, month, and day. |
| </p> |
| </section> |
| |
| <section id="glos_cancel"> |
| |
| <title>cancel</title> |
| |
| <p> |
| Halting an Impala query before it is completely finished. |
| </p> |
| </section> |
| |
| <section id="glos_streaming"> |
| |
| <title>streaming</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_sorting"> |
| |
| <title>sorting</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_aggregation"> |
| |
| <title>aggregation</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_fragment"> |
| |
| <title>fragment</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_source"> |
| |
| <title>source</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_sink"> |
| |
| <title>sink</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_thrift"> |
| |
| <title>Thrift</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_delegation"> |
| |
| <title>delegation</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_authorization"> |
| |
| <title>authorization</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_authentication"> |
| |
| <title>authentication</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_partition_pruning"> |
| |
| <title>partition pruning</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_heartbeat"> |
| |
| <title>heartbeat</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_subscriber"> |
| |
| <title>subscriber</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_topic"> |
| |
| <title>topic</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_broadcast_join"> |
| |
| <title>broadcast join</title> |
| |
| <p></p> |
| </section> |
| |
| <section id="glos_shuffle_join"> |
| |
| <title>shuffle join</title> |
| |
| <p></p> |
| </section> |
| |
| <!-- Use as a template for new definitions: |
| <section id="glos_"> |
| <title></title> |
| <p> |
| </p> |
| </section> |
| |
| --> |
| </conbody> |
| </concept> |