| /* |
| * 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 |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * 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. |
| */ |
| package org.apache.drill.exec.store.ischema; |
| |
| import org.apache.calcite.schema.Schema; |
| import org.apache.calcite.schema.SchemaPlus; |
| import org.apache.drill.exec.store.AbstractSchema; |
| import org.apache.drill.exec.store.dfs.WorkspaceSchemaFactory; |
| import org.apache.drill.shaded.guava.com.google.common.collect.ImmutableMap; |
| |
| import java.util.Map; |
| |
| import static org.apache.drill.exec.store.ischema.InfoSchemaConstants.CATS_COL_CATALOG_NAME; |
| import static org.apache.drill.exec.store.ischema.InfoSchemaConstants.COLS_COL_COLUMN_NAME; |
| import static org.apache.drill.exec.store.ischema.InfoSchemaConstants.FILES_COL_ROOT_SCHEMA_NAME; |
| import static org.apache.drill.exec.store.ischema.InfoSchemaConstants.FILES_COL_SCHEMA_NAME; |
| import static org.apache.drill.exec.store.ischema.InfoSchemaConstants.FILES_COL_WORKSPACE_NAME; |
| import static org.apache.drill.exec.store.ischema.InfoSchemaConstants.IS_CATALOG_NAME; |
| import static org.apache.drill.exec.store.ischema.InfoSchemaConstants.SCHS_COL_SCHEMA_NAME; |
| import static org.apache.drill.exec.store.ischema.InfoSchemaConstants.SHRD_COL_TABLE_NAME; |
| import static org.apache.drill.exec.store.ischema.InfoSchemaConstants.SHRD_COL_TABLE_SCHEMA; |
| import static org.apache.drill.exec.store.ischema.InfoSchemaConstants.TBLS_COL_TABLE_TYPE; |
| |
| /** |
| * Evaluates information schema for the given condition. |
| * Evaluation can be done with or without filter. |
| */ |
| public interface FilterEvaluator { |
| |
| /** |
| * Visit the catalog. Drill has only one catalog. |
| * |
| * @return whether to continue exploring the contents of the catalog or not. |
| * Contents are schema/schema tree. |
| */ |
| boolean shouldVisitCatalog(); |
| |
| /** |
| * Visit the given schema. |
| * |
| * @param schemaName name of the schema |
| * @param schema schema object |
| * @return whether to continue exploring the contents of the schema or not. |
| * Contents are tables within the schema. |
| */ |
| boolean shouldVisitSchema(String schemaName, SchemaPlus schema); |
| |
| /** |
| * Visit the tables in the given schema. |
| * |
| * @param schemaName name of the schema |
| * @param tableName name of the table |
| * @param tableType type of the table |
| * @return whether to continue exploring the contents of the table or not. |
| * Contents are tables attributes and columns. |
| */ |
| boolean shouldVisitTable(String schemaName, String tableName, Schema.TableType tableType); |
| |
| /** |
| * Visit the columns in the given schema and table. |
| * |
| * @param schemaName name of the schema |
| * @param tableName name of the table |
| * @param columnName type of the table |
| * @return whether to continue exploring the contents of the column or not. |
| * Contents are columns attributes. |
| */ |
| boolean shouldVisitColumn(String schemaName, String tableName, String columnName); |
| |
| /** |
| * Visit the files in the given schema. |
| * |
| * @param schemaName name of the schema |
| * @param schema schema object |
| * @return whether to continue exploring the files in the schema |
| */ |
| boolean shouldVisitFiles(String schemaName, SchemaPlus schema); |
| |
| |
| /** |
| * Evaluates necessity to visit certain type of information_schema data based |
| * on given schema type. |
| */ |
| class NoFilterEvaluator implements FilterEvaluator { |
| |
| public static final FilterEvaluator INSTANCE = new NoFilterEvaluator(); |
| |
| @Override |
| public boolean shouldVisitCatalog() { |
| return true; |
| } |
| |
| @Override |
| public boolean shouldVisitSchema(String schemaName, SchemaPlus schema) { |
| if (schemaName == null || schemaName.isEmpty()) { |
| return false; |
| } |
| |
| try { |
| AbstractSchema drillSchema = schema.unwrap(AbstractSchema.class); |
| return drillSchema.showInInformationSchema(); |
| } catch (ClassCastException e) { |
| return false; |
| } |
| } |
| |
| @Override |
| public boolean shouldVisitTable(String schemaName, String tableName, Schema.TableType tableType) { |
| return true; |
| } |
| |
| @Override |
| public boolean shouldVisitColumn(String schemaName, String tableName, String columnName) { |
| return true; |
| } |
| |
| @Override |
| public boolean shouldVisitFiles(String schemaName, SchemaPlus schema) { |
| try { |
| AbstractSchema drillSchema = schema.unwrap(AbstractSchema.class); |
| return drillSchema instanceof WorkspaceSchemaFactory.WorkspaceSchema; |
| } catch (ClassCastException e) { |
| return false; |
| } |
| } |
| } |
| |
| /** |
| * Evaluates necessity to visit certain type of information_schema data using provided filter. |
| */ |
| class InfoSchemaFilterEvaluator extends NoFilterEvaluator { |
| |
| private final InfoSchemaFilter filter; |
| |
| public InfoSchemaFilterEvaluator(InfoSchemaFilter filter) { |
| this.filter = filter; |
| } |
| |
| @Override |
| public boolean shouldVisitCatalog() { |
| Map<String, String> recordValues = ImmutableMap.of(CATS_COL_CATALOG_NAME, IS_CATALOG_NAME); |
| |
| return filter.evaluate(recordValues) != InfoSchemaFilter.Result.FALSE; |
| } |
| |
| @Override |
| public boolean shouldVisitSchema(String schemaName, SchemaPlus schema) { |
| if (!super.shouldVisitSchema(schemaName, schema)) { |
| return false; |
| } |
| |
| Map<String, String> recordValues = ImmutableMap.of( |
| CATS_COL_CATALOG_NAME, IS_CATALOG_NAME, |
| SHRD_COL_TABLE_SCHEMA, schemaName, |
| SCHS_COL_SCHEMA_NAME, schemaName); |
| |
| return filter.evaluate(recordValues) != InfoSchemaFilter.Result.FALSE; |
| } |
| |
| @Override |
| public boolean shouldVisitTable(String schemaName, String tableName, Schema.TableType tableType) { |
| Map<String, String> recordValues = ImmutableMap.of( |
| CATS_COL_CATALOG_NAME, IS_CATALOG_NAME, |
| SHRD_COL_TABLE_SCHEMA, schemaName, |
| SCHS_COL_SCHEMA_NAME, schemaName, |
| SHRD_COL_TABLE_NAME, tableName, |
| TBLS_COL_TABLE_TYPE, tableType.jdbcName); |
| |
| return filter.evaluate(recordValues) != InfoSchemaFilter.Result.FALSE; |
| } |
| |
| @Override |
| public boolean shouldVisitColumn(String schemaName, String tableName, String columnName) { |
| Map<String, String> recordValues = ImmutableMap.of( |
| CATS_COL_CATALOG_NAME, IS_CATALOG_NAME, |
| SHRD_COL_TABLE_SCHEMA, schemaName, |
| SCHS_COL_SCHEMA_NAME, schemaName, |
| SHRD_COL_TABLE_NAME, tableName, |
| COLS_COL_COLUMN_NAME, columnName); |
| |
| return filter.evaluate(recordValues) != InfoSchemaFilter.Result.FALSE; |
| } |
| |
| @Override |
| public boolean shouldVisitFiles(String schemaName, SchemaPlus schema) { |
| if (!super.shouldVisitFiles(schemaName, schema)) { |
| return false; |
| } |
| |
| AbstractSchema drillSchema = schema.unwrap(AbstractSchema.class); |
| WorkspaceSchemaFactory.WorkspaceSchema wsSchema = (WorkspaceSchemaFactory.WorkspaceSchema) drillSchema; |
| |
| Map<String, String> recordValues = ImmutableMap.of( |
| FILES_COL_SCHEMA_NAME, schemaName, |
| FILES_COL_ROOT_SCHEMA_NAME, wsSchema.getSchemaPath().get(0), |
| FILES_COL_WORKSPACE_NAME, wsSchema.getName()); |
| |
| return filter.evaluate(recordValues) != InfoSchemaFilter.Result.FALSE; |
| } |
| } |
| } |