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From gparai <...@git.apache.org>
Subject [GitHub] drill pull request #729: Drill 1328: Support table statistics for Parquet
Date Tue, 21 Feb 2017 23:20:43 GMT
Github user gparai commented on a diff in the pull request:

    https://github.com/apache/drill/pull/729#discussion_r102345408
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/planner/cost/DrillRelMdSelectivity.java
---
    @@ -0,0 +1,219 @@
    +/*******************************************************************************
    + * 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.cost;
    +
    +import org.apache.calcite.plan.RelOptUtil;
    +import org.apache.calcite.plan.volcano.RelSubset;
    +import org.apache.calcite.rel.RelNode;
    +import org.apache.calcite.rel.SingleRel;
    +import org.apache.calcite.rel.core.JoinRelType;
    +import org.apache.calcite.rel.core.TableScan;
    +import org.apache.calcite.rel.metadata.ReflectiveRelMetadataProvider;
    +import org.apache.calcite.rel.metadata.RelMdSelectivity;
    +import org.apache.calcite.rel.metadata.RelMdUtil;
    +import org.apache.calcite.rel.metadata.RelMetadataProvider;
    +import org.apache.calcite.rel.metadata.RelMetadataQuery;
    +import org.apache.calcite.rel.type.RelDataType;
    +import org.apache.calcite.rex.RexBuilder;
    +import org.apache.calcite.rex.RexCall;
    +import org.apache.calcite.rex.RexInputRef;
    +import org.apache.calcite.rex.RexNode;
    +import org.apache.calcite.rex.RexUtil;
    +import org.apache.calcite.rex.RexVisitor;
    +import org.apache.calcite.rex.RexVisitorImpl;
    +import org.apache.calcite.sql.SqlKind;
    +import org.apache.calcite.util.BuiltInMethod;
    +import org.apache.calcite.util.Util;
    +import org.apache.drill.exec.planner.common.DrillJoinRelBase;
    +import org.apache.drill.exec.planner.common.DrillRelOptUtil;
    +import org.apache.drill.exec.planner.logical.DrillTable;
    +import org.apache.drill.exec.planner.logical.DrillTranslatableTable;
    +
    +import java.util.ArrayList;
    +import java.util.List;
    +
    +public class DrillRelMdSelectivity extends RelMdSelectivity {
    +  private static final org.slf4j.Logger logger =
    +      org.slf4j.LoggerFactory.getLogger(RelMdSelectivity.class);
    +
    +  private static final DrillRelMdSelectivity INSTANCE =
    +      new DrillRelMdSelectivity();
    +
    +  public static final RelMetadataProvider SOURCE =
    +      ReflectiveRelMetadataProvider.reflectiveSource(
    +          BuiltInMethod.SELECTIVITY.method, INSTANCE);
    +
    +  @Override
    +  public Double getSelectivity(RelNode rel, RexNode predicate) {
    +    if (rel instanceof TableScan) {
    +      return getScanSelectivity((TableScan) rel, predicate);
    +    } else if (rel instanceof DrillJoinRelBase) {
    +      return getJoinSelectivity(((DrillJoinRelBase) rel), predicate);
    +    } else if (rel instanceof SingleRel && !DrillRelOptUtil.guessRows(rel)) {
    +        return RelMetadataQuery.getSelectivity(((SingleRel) rel).getInput(), predicate);
    +    } else if (rel instanceof RelSubset && !DrillRelOptUtil.guessRows(rel)) {
    +      if (((RelSubset) rel).getBest() != null) {
    +        return RelMetadataQuery.getSelectivity(((RelSubset)rel).getBest(), predicate);
    +      } else if (((RelSubset)rel).getOriginal() != null) {
    +        return RelMetadataQuery.getSelectivity(((RelSubset)rel).getOriginal(), predicate);
    +      } else {
    +        return super.getSelectivity(rel, predicate);
    +      }
    +    } else {
    +      return super.getSelectivity(rel, predicate);
    +    }
    +  }
    +
    +  private Double getJoinSelectivity(DrillJoinRelBase rel, RexNode predicate) {
    +    double sel = 1.0;
    +    // determine which filters apply to the left vs right
    +    RexNode leftPred = null;
    +    RexNode rightPred = null;
    +    JoinRelType joinType = rel.getJoinType();
    +    final RexBuilder rexBuilder = rel.getCluster().getRexBuilder();
    +    int[] adjustments = new int[rel.getRowType().getFieldCount()];
    +
    +    if (DrillRelOptUtil.guessRows(rel)) {
    +      return super.getSelectivity(rel, predicate);
    +    }
    +
    +    if (predicate != null) {
    +      RexNode pred;
    +      List<RexNode> leftFilters = new ArrayList<RexNode>();
    +      List<RexNode> rightFilters = new ArrayList<RexNode>();
    +      List<RexNode> joinFilters = new ArrayList<RexNode>();
    +      List<RexNode> predList = RelOptUtil.conjunctions(predicate);
    +
    +      RelOptUtil.classifyFilters(
    +          rel,
    +          predList,
    +          joinType,
    +          joinType == JoinRelType.INNER,
    +          !joinType.generatesNullsOnLeft(),
    +          !joinType.generatesNullsOnRight(),
    +          joinFilters,
    +          leftFilters,
    +          rightFilters);
    +      leftPred =
    +          RexUtil.composeConjunction(rexBuilder, leftFilters, true);
    +      rightPred =
    +          RexUtil.composeConjunction(rexBuilder, rightFilters, true);
    +      for (RelNode child : rel.getInputs()) {
    +        RexNode modifiedPred = null;
    +
    +        if (child == rel.getLeft()) {
    +          pred = leftPred;
    +        } else {
    +          pred = rightPred;
    +        }
    +        if (pred != null) {
    +          // convert the predicate to reference the types of the children
    +          modifiedPred =
    +              pred.accept(new RelOptUtil.RexInputConverter(
    +              rexBuilder,
    +              null,
    +              child.getRowType().getFieldList(),
    +              adjustments));
    +        }
    +        sel *= RelMetadataQuery.getSelectivity(child, modifiedPred);
    +      }
    +      sel *= RelMdUtil.guessSelectivity(
    +          RexUtil.composeConjunction(rexBuilder, joinFilters, true));
    +    }
    +    return sel;
    +  }
    +
    +  private Double getScanSelectivity(TableScan scan, RexNode predicate) {
    +    DrillTable table = scan.getTable().unwrap(DrillTable.class);
    +    if (table == null) {
    +      table = scan.getTable().unwrap(DrillTranslatableTable.class).getDrillTable();
    +    }
    +    if (table == null || table.getStatsTable() == null) {
    +      return super.getSelectivity(scan, predicate);
    +    } else {
    +      return getScanSelectivityInternal(table, predicate, scan.getRowType());
    +    }
    +  }
    +
    +  private Double getScanSelectivityInternal(DrillTable table, RexNode predicate,
    +      RelDataType type) {
    +    double sel = 1.0;
    +
    +    if ((predicate == null) || predicate.isAlwaysTrue()) {
    +      return sel;
    +    }
    +
    +    for (RexNode pred : RelOptUtil.conjunctions(predicate)) {
    +      double orSel = 0;
    +      for (RexNode orPred : RelOptUtil.disjunctions(pred)) {
    +        //CALCITE guess
    +        Double guess = RelMdUtil.guessSelectivity(pred);
    +        if (orPred.isA(SqlKind.EQUALS)) {
    --- End diff --
    
    As discussed, the DRILL-5254 changes need to go in as Calcite changes. So this change
can be done only after we get these changes into Calcite. 


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