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[FLINK-3640] Add support for SQL in DataSet programs
- add EnumerableToLogicalScan rule - in order to be able to mix TableAPI and SQL, we need our own copy of PlannerImpl - create a dummy RelNode in the reset() method, in order to retrieve the RelOptPlanner This closes apache#1862
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47 changes: 47 additions & 0 deletions
47
...ries/flink-table/src/main/scala/org/apache/flink/api/table/FlinkCalciteSqlValidator.scala
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| /* | ||
| * 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:https://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. | ||
| */ | ||
|
|
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| package org.apache.flink.api.table | ||
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| import org.apache.calcite.adapter.java.JavaTypeFactory | ||
| import org.apache.calcite.prepare.CalciteCatalogReader | ||
| import org.apache.calcite.rel.`type`.RelDataType | ||
| import org.apache.calcite.sql.{SqlInsert, SqlOperatorTable} | ||
| import org.apache.calcite.sql.validate.{SqlValidatorImpl, SqlConformance} | ||
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| /** | ||
| * This is a copy of Calcite's CalciteSqlValidator to use with [[FlinkPlannerImpl]]. | ||
| */ | ||
| class FlinkCalciteSqlValidator( | ||
| opTab: SqlOperatorTable, | ||
| catalogReader: CalciteCatalogReader, | ||
| typeFactory: JavaTypeFactory) extends SqlValidatorImpl( | ||
| opTab, catalogReader, typeFactory, SqlConformance.DEFAULT) { | ||
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| override def getLogicalSourceRowType( | ||
| sourceRowType: RelDataType, | ||
| insert: SqlInsert): RelDataType = { | ||
| typeFactory.asInstanceOf[JavaTypeFactory].toSql(sourceRowType) | ||
| } | ||
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| override def getLogicalTargetRowType( | ||
| targetRowType: RelDataType, | ||
| insert: SqlInsert): RelDataType = { | ||
| typeFactory.asInstanceOf[JavaTypeFactory].toSql(targetRowType) | ||
| } | ||
| } |
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flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/FlinkPlannerImpl.scala
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| /* | ||
| * 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:https://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. | ||
| */ | ||
|
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| package org.apache.flink.api.table | ||
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| import java.util | ||
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| import com.google.common.collect.ImmutableList | ||
| import org.apache.calcite.adapter.java.JavaTypeFactory | ||
| import org.apache.calcite.jdbc.CalciteSchema | ||
| import org.apache.calcite.plan.RelOptTable.ViewExpander | ||
| import org.apache.calcite.plan._ | ||
| import org.apache.calcite.prepare.CalciteCatalogReader | ||
| import org.apache.calcite.rel.RelRoot | ||
| import org.apache.calcite.rel.`type`.RelDataType | ||
| import org.apache.calcite.rex.RexBuilder | ||
| import org.apache.calcite.schema.SchemaPlus | ||
| import org.apache.calcite.sql.parser.{SqlParser, SqlParseException} | ||
| import org.apache.calcite.sql.validate.SqlValidator | ||
| import org.apache.calcite.sql.{SqlNode, SqlOperatorTable} | ||
| import org.apache.calcite.sql2rel.{RelDecorrelator, SqlToRelConverter, SqlRexConvertletTable} | ||
| import org.apache.calcite.tools.{RelConversionException, ValidationException, Frameworks, FrameworkConfig} | ||
| import org.apache.calcite.util.Util | ||
| import scala.collection.JavaConversions._ | ||
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| /** NOTE: this is heavily insipred by Calcite's PlannerImpl. | ||
| We need it in order to share the planner between the Table API relational plans | ||
| and the SQL relation plans that are created by the Calcite parser. | ||
| The only difference is that we initialize the RelOptPlanner planner | ||
| when instantiating, instead of creating a new one in the ready() method. **/ | ||
| class FlinkPlannerImpl(config: FrameworkConfig, var planner: RelOptPlanner) { | ||
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| val operatorTable: SqlOperatorTable = config.getOperatorTable | ||
| /** Holds the trait definitions to be registered with planner. May be null. */ | ||
| val traitDefs: ImmutableList[RelTraitDef[_ <: RelTrait]] = config.getTraitDefs | ||
| val parserConfig: SqlParser.Config = config.getParserConfig | ||
| val convertletTable: SqlRexConvertletTable = config.getConvertletTable | ||
| var defaultSchema: SchemaPlus = config.getDefaultSchema | ||
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| var typeFactory: JavaTypeFactory = null | ||
| var validator: FlinkCalciteSqlValidator = null | ||
| var validatedSqlNode: SqlNode = null | ||
| var root: RelRoot = null | ||
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| private def ready() { | ||
| Frameworks.withPlanner(new Frameworks.PlannerAction[Unit] { | ||
| def apply( | ||
| cluster: RelOptCluster, | ||
| relOptSchema: RelOptSchema, | ||
| rootSchema: SchemaPlus): Unit = { | ||
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| Util.discard(rootSchema) | ||
| typeFactory = cluster.getTypeFactory.asInstanceOf[JavaTypeFactory] | ||
| if (planner == null) { | ||
| planner = cluster.getPlanner | ||
| } | ||
| } | ||
| }, config) | ||
| if (this.traitDefs != null) { | ||
| planner.clearRelTraitDefs() | ||
| for (traitDef <- this.traitDefs) { | ||
| planner.addRelTraitDef(traitDef) | ||
| } | ||
| } | ||
| } | ||
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| @throws(classOf[SqlParseException]) | ||
| def parse(sql: String): SqlNode = { | ||
| ready() | ||
| val parser: SqlParser = SqlParser.create(sql, parserConfig) | ||
| val sqlNode: SqlNode = parser.parseStmt | ||
| sqlNode | ||
| } | ||
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| @throws(classOf[ValidationException]) | ||
| def validate(sqlNode: SqlNode): SqlNode = { | ||
| validator = new FlinkCalciteSqlValidator(operatorTable, createCatalogReader, typeFactory) | ||
| validator.setIdentifierExpansion(true) | ||
| try { | ||
| validatedSqlNode = validator.validate(sqlNode) | ||
| } | ||
| catch { | ||
| case e: RuntimeException => { | ||
| throw new ValidationException(e) | ||
| } | ||
| } | ||
| validatedSqlNode | ||
| } | ||
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| @throws(classOf[RelConversionException]) | ||
| def rel(sql: SqlNode): RelRoot = { | ||
| assert(validatedSqlNode != null) | ||
| val rexBuilder: RexBuilder = createRexBuilder | ||
| val cluster: RelOptCluster = RelOptCluster.create(planner, rexBuilder) | ||
| val sqlToRelConverter: SqlToRelConverter = new SqlToRelConverter( | ||
| new ViewExpanderImpl, validator, createCatalogReader, cluster, convertletTable) | ||
| sqlToRelConverter.setTrimUnusedFields(false) | ||
| sqlToRelConverter.enableTableAccessConversion(false) | ||
| root = sqlToRelConverter.convertQuery(validatedSqlNode, false, true) | ||
| root = root.withRel(sqlToRelConverter.flattenTypes(root.rel, true)) | ||
| root = root.withRel(RelDecorrelator.decorrelateQuery(root.rel)) | ||
| root | ||
| } | ||
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| /** Implements [[org.apache.calcite.plan.RelOptTable.ViewExpander]] | ||
| * interface for [[org.apache.calcite.tools.Planner]]. */ | ||
| class ViewExpanderImpl extends ViewExpander { | ||
|
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| override def expandView( | ||
| rowType: RelDataType, | ||
| queryString: String, | ||
| schemaPath: util.List[String]): RelRoot = { | ||
|
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| val parser: SqlParser = SqlParser.create(queryString, parserConfig) | ||
| var sqlNode: SqlNode = null | ||
| try { | ||
| sqlNode = parser.parseQuery | ||
| } | ||
| catch { | ||
| case e: SqlParseException => | ||
| throw new RuntimeException("parse failed", e) | ||
| } | ||
| val catalogReader: CalciteCatalogReader = createCatalogReader.withSchemaPath(schemaPath) | ||
| val validator: SqlValidator = | ||
| new FlinkCalciteSqlValidator(operatorTable, catalogReader, typeFactory) | ||
| validator.setIdentifierExpansion(true) | ||
| val validatedSqlNode: SqlNode = validator.validate(sqlNode) | ||
| val rexBuilder: RexBuilder = createRexBuilder | ||
| val cluster: RelOptCluster = RelOptCluster.create(planner, rexBuilder) | ||
| val sqlToRelConverter: SqlToRelConverter = new SqlToRelConverter( | ||
| new ViewExpanderImpl, validator, catalogReader, cluster, convertletTable) | ||
| sqlToRelConverter.setTrimUnusedFields(false) | ||
| sqlToRelConverter.enableTableAccessConversion(false) | ||
| root = sqlToRelConverter.convertQuery(validatedSqlNode, true, false) | ||
| root = root.withRel(sqlToRelConverter.flattenTypes(root.rel, true)) | ||
| root = root.withRel(RelDecorrelator.decorrelateQuery(root.rel)) | ||
| FlinkPlannerImpl.this.root | ||
| } | ||
| } | ||
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| private def createCatalogReader: CalciteCatalogReader = { | ||
| val rootSchema: SchemaPlus = FlinkPlannerImpl.rootSchema(defaultSchema) | ||
| new CalciteCatalogReader( | ||
| CalciteSchema.from(rootSchema), | ||
| parserConfig.caseSensitive, | ||
| CalciteSchema.from(defaultSchema).path(null), | ||
| typeFactory) | ||
| } | ||
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| private def createRexBuilder: RexBuilder = { | ||
| new RexBuilder(typeFactory) | ||
| } | ||
|
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| } | ||
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| object FlinkPlannerImpl { | ||
| private def rootSchema(schema: SchemaPlus): SchemaPlus = { | ||
| if (schema.getParentSchema == null) { | ||
| schema | ||
| } | ||
| else { | ||
| rootSchema(schema.getParentSchema) | ||
| } | ||
| } | ||
| } |
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