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From jinfengni <...@git.apache.org>
Subject [GitHub] drill pull request: DRILL-4465: Simplify Calcite parsing & plannin...
Date Thu, 03 Mar 2016 17:13:44 GMT
Github user jinfengni commented on a diff in the pull request:

    https://github.com/apache/drill/pull/401#discussion_r54912629
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/DrillSqlParser.java
---
    @@ -0,0 +1,349 @@
    +/**
    + * 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.planner.sql;
    +
    +import java.util.Arrays;
    +import java.util.List;
    +
    +import org.apache.calcite.adapter.java.JavaTypeFactory;
    +import org.apache.calcite.avatica.util.Casing;
    +import org.apache.calcite.avatica.util.Quoting;
    +import org.apache.calcite.jdbc.CalciteSchemaImpl;
    +import org.apache.calcite.jdbc.JavaTypeFactoryImpl;
    +import org.apache.calcite.plan.ConventionTraitDef;
    +import org.apache.calcite.plan.RelOptCluster;
    +import org.apache.calcite.plan.RelOptCostFactory;
    +import org.apache.calcite.plan.RelOptTable;
    +import org.apache.calcite.plan.volcano.VolcanoPlanner;
    +import org.apache.calcite.prepare.CalciteCatalogReader;
    +import org.apache.calcite.rel.RelCollationTraitDef;
    +import org.apache.calcite.rel.RelNode;
    +import org.apache.calcite.rel.type.RelDataType;
    +import org.apache.calcite.rel.type.RelDataTypeFactory;
    +import org.apache.calcite.rel.type.RelDataTypeSystemImpl;
    +import org.apache.calcite.rex.RexBuilder;
    +import org.apache.calcite.schema.SchemaPlus;
    +import org.apache.calcite.sql.SqlNode;
    +import org.apache.calcite.sql.SqlOperatorTable;
    +import org.apache.calcite.sql.parser.SqlParseException;
    +import org.apache.calcite.sql.parser.SqlParser;
    +import org.apache.calcite.sql.parser.SqlParserImplFactory;
    +import org.apache.calcite.sql.parser.SqlParserPos;
    +import org.apache.calcite.sql.type.SqlTypeName;
    +import org.apache.calcite.sql.util.ChainedSqlOperatorTable;
    +import org.apache.calcite.sql.validate.SqlConformance;
    +import org.apache.calcite.sql.validate.SqlValidatorCatalogReader;
    +import org.apache.calcite.sql.validate.SqlValidatorImpl;
    +import org.apache.calcite.sql2rel.RelDecorrelator;
    +import org.apache.calcite.sql2rel.SqlToRelConverter;
    +import org.apache.drill.common.exceptions.UserException;
    +import org.apache.drill.exec.expr.fn.FunctionImplementationRegistry;
    +import org.apache.drill.exec.ops.UdfUtilities;
    +import org.apache.drill.exec.planner.cost.DrillCostBase;
    +import org.apache.drill.exec.planner.logical.DrillConstExecutor;
    +import org.apache.drill.exec.planner.physical.DrillDistributionTraitDef;
    +import org.apache.drill.exec.planner.physical.PlannerSettings;
    +import org.apache.drill.exec.planner.sql.parser.impl.DrillParserWithCompoundIdConverter;
    +
    +/**
    + * Class responsible for managing parsing, validation and toRel conversion for sql statements.
    + */
    +public class DrillSqlParser {
    +  private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(DrillSqlParser.class);
    +
    +  private static DrillTypeSystem DRILL_TYPE_SYSTEM = new DrillTypeSystem();
    +
    +  private final JavaTypeFactory typeFactory;
    +  private final SqlParser.Config parserConfig;
    +  private final CalciteCatalogReader catalog;
    +  private final PlannerSettings settings;
    +  private final SchemaPlus rootSchema;
    +  private final SchemaPlus defaultSchema;
    +  private final SqlOperatorTable opTab;
    +  private final RelOptCostFactory costFactory;
    +  private final DrillValidator validator;
    +  private final boolean isInnerQuery;
    +  private final UdfUtilities util;
    +  private final FunctionImplementationRegistry functions;
    +
    +  private String sql;
    +  private VolcanoPlanner planner;
    +
    +
    +  public DrillSqlParser(PlannerSettings settings, SchemaPlus defaultSchema,
    +      final SqlOperatorTable operatorTable, UdfUtilities util, FunctionImplementationRegistry
functions) {
    +    this.settings = settings;
    +    this.util = util;
    +    this.functions = functions;
    +    this.parserConfig = new ParserConfig();
    +    this.isInnerQuery = false;
    +    this.typeFactory = new JavaTypeFactoryImpl(DRILL_TYPE_SYSTEM);
    +    this.defaultSchema = defaultSchema;
    +    this.rootSchema = rootSchema(defaultSchema);
    +    this.catalog = new CalciteCatalogReader(
    +        CalciteSchemaImpl.from(rootSchema),
    +        parserConfig.caseSensitive(),
    +        CalciteSchemaImpl.from(defaultSchema).path(null),
    +        typeFactory);
    +    this.opTab = new ChainedSqlOperatorTable(Arrays.asList(operatorTable, catalog));
    +    this.costFactory = (settings.useDefaultCosting()) ? null : new DrillCostBase.DrillCostFactory();
    +    this.validator = new DrillValidator(opTab, catalog, typeFactory, SqlConformance.DEFAULT);
    +    validator.setIdentifierExpansion(true);
    +  }
    +
    +  private DrillSqlParser(DrillSqlParser parent, SchemaPlus defaultSchema, SchemaPlus
rootSchema,
    +      CalciteCatalogReader catalog) {
    +    this.parserConfig = parent.parserConfig;
    +    this.defaultSchema = defaultSchema;
    +    this.functions = parent.functions;
    +    this.util = parent.util;
    +    this.isInnerQuery = true;
    +    this.typeFactory = parent.typeFactory;
    +    this.costFactory = parent.costFactory;
    +    this.settings = parent.settings;
    +    this.rootSchema = rootSchema;
    +    this.catalog = catalog;
    +    this.opTab = parent.opTab;
    +    this.planner = parent.planner;
    +    this.validator = new DrillValidator(opTab, catalog, typeFactory, SqlConformance.DEFAULT);
    +    validator.setIdentifierExpansion(true);
    +  }
    +
    +
    +  public SqlNode parse(String sql) {
    +    try {
    +      SqlParser parser = SqlParser.create(sql, parserConfig);
    +      return parser.parseStmt();
    +    } catch (SqlParseException e) {
    +      throw UserException
    +          .parseError(e)
    +          .message(isInnerQuery ? "Failure parsing a view your query is dependent upon."
: "Failure parsing query.")
    +          .addContext("SQL Query", formatSQLParsingError(sql, e.getPos()))
    +          .build(logger);
    +    }
    +
    +  }
    +
    +  public SqlNode validate(final SqlNode parsedNode) {
    +    try {
    +      SqlNode validatedNode = validator.validate(parsedNode);
    +      return validatedNode;
    +    } catch (RuntimeException e) {
    +      throw UserException
    +          .validationError(e)
    +          .message(isInnerQuery ?
    +              "Failure validating a view your query is dependent upon." : "Failure validating
query.")
    +          .addContext("SQL query", sql)
    +          .build(logger);
    +    }
    +  }
    +
    +  public RelDataType getOutputType(SqlNode validatedNode) {
    +    return validator.getValidatedNodeType(validatedNode);
    +  }
    +
    +  public JavaTypeFactory getTypeFactory() {
    +    return typeFactory;
    +  }
    +
    +  public SqlOperatorTable getOpTab() {
    +    return opTab;
    +  }
    +
    +  public RelOptCostFactory getCostFactory() {
    +    return costFactory;
    +  }
    +
    +  public SchemaPlus getRootSchema() {
    +    return rootSchema;
    +  }
    +
    +  public SchemaPlus getDefaultSchema() {
    +    return defaultSchema;
    +  }
    +
    +  private class DrillValidator extends SqlValidatorImpl {
    +    protected DrillValidator(SqlOperatorTable opTab, SqlValidatorCatalogReader catalogReader,
    +        RelDataTypeFactory typeFactory, SqlConformance conformance) {
    +      super(opTab, catalogReader, typeFactory, conformance);
    +    }
    +  }
    +
    +  private static class DrillTypeSystem extends RelDataTypeSystemImpl {
    +
    +    @Override
    +    public int getDefaultPrecision(SqlTypeName typeName) {
    +      switch (typeName) {
    +      case CHAR:
    +      case BINARY:
    +      case VARCHAR:
    +      case VARBINARY:
    +        return 65536;
    +      default:
    +        return super.getDefaultPrecision(typeName);
    +      }
    +    }
    +
    +    @Override
    +    public int getMaxNumericScale() {
    +      return 38;
    +    }
    +
    +    @Override
    +    public int getMaxNumericPrecision() {
    +      return 38;
    +    }
    +
    +  }
    +
    +  public RelNode toRel(
    +      final SqlNode validatedNode) {
    +    final RexBuilder rexBuilder = new RexBuilder(typeFactory);
    +    if (planner == null) {
    +      planner = new VolcanoPlanner(costFactory, settings);
    +      planner.setExecutor(new DrillConstExecutor(functions, util, settings));
    +      planner.clearRelTraitDefs();
    +      planner.addRelTraitDef(ConventionTraitDef.INSTANCE);
    +      planner.addRelTraitDef(DrillDistributionTraitDef.INSTANCE);
    +      planner.addRelTraitDef(RelCollationTraitDef.INSTANCE);
    +    }
    +
    +    final RelOptCluster cluster = RelOptCluster.create(planner, rexBuilder);
    +    final SqlToRelConverter sqlToRelConverter =
    +        new SqlToRelConverter(new Expander(), validator, catalog, cluster, DrillConvertletTable.INSTANCE);
    +
    +    sqlToRelConverter.setTrimUnusedFields(false);
    +    sqlToRelConverter.enableTableAccessConversion(false);
    +    final RelNode rel = sqlToRelConverter.convertQuery(validatedNode, false, true);
    +    final RelNode rel2 = sqlToRelConverter.flattenTypes(rel, true);
    +    final RelNode rel3 = RelDecorrelator.decorrelateQuery(rel2);
    +    return rel3;
    +
    +  }
    +
    +  private class Expander implements RelOptTable.ViewExpander {
    +
    +    public Expander() {
    +    }
    +
    +    public RelNode expandView(
    +        RelDataType rowType,
    +        String queryString,
    +        List<String> schemaPath) {
    +      DrillSqlParser parser = new DrillSqlParser(DrillSqlParser.this, defaultSchema,
rootSchema,
    +          catalog.withSchemaPath(schemaPath));
    +      return expandView(queryString, parser);
    +    }
    +
    +    @Override
    +    public RelNode expandView(
    +        RelDataType rowType,
    +        String queryString,
    +        SchemaPlus rootSchema, // new root schema
    +        List<String> schemaPath) {
    +      final CalciteCatalogReader catalogReader = new CalciteCatalogReader(
    +          CalciteSchemaImpl.from(rootSchema),
    +          parserConfig.caseSensitive(),
    +          schemaPath,
    +          typeFactory);
    +      SchemaPlus schema = rootSchema;
    +      for (String s : schemaPath) {
    +        schema = schema.getSubSchema(s);
    --- End diff --
    
    Is it possible that schema.getSubSchema(s) could return null? In such case, the next loop
iteration will possibly hit NPE. 


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