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From gparai <...@git.apache.org>
Subject [GitHub] drill pull request #729: Drill 1328: Support table statistics for Parquet
Date Wed, 01 Mar 2017 04:18:43 GMT
Github user gparai commented on a diff in the pull request:

    https://github.com/apache/drill/pull/729#discussion_r103608020
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/planner/common/DrillRelOptUtil.java
---
    @@ -169,4 +182,99 @@ private static boolean containIdentity(List<? extends RexNode>
exps,
         }
         return true;
       }
    +
    +  /**
    +   * Returns whether statistics-based estimates or guesses are used by the optimizer
    +   * */
    +  public static boolean guessRows(RelNode rel) {
    +    final PlannerSettings settings =
    +        rel.getCluster().getPlanner().getContext().unwrap(PlannerSettings.class);
    +    if (!settings.useStatistics()) {
    +      return true;
    +    }
    +    if (rel instanceof RelSubset) {
    +      if (((RelSubset) rel).getBest() != null) {
    +        return guessRows(((RelSubset) rel).getBest());
    +      } else if (((RelSubset) rel).getOriginal() != null) {
    +        return guessRows(((RelSubset) rel).getOriginal());
    +      }
    +    } else if (rel instanceof HepRelVertex) {
    +      if (((HepRelVertex) rel).getCurrentRel() != null) {
    +        return guessRows(((HepRelVertex) rel).getCurrentRel());
    +      }
    +    } else if (rel instanceof TableScan) {
    +      DrillTable table = rel.getTable().unwrap(DrillTable.class);
    +      if (table == null) {
    +        table = rel.getTable().unwrap(DrillTranslatableTable.class).getDrillTable();
    +      }
    +      if (table != null && table.getStatsTable() != null) {
    +        return false;
    +      } else {
    +        return true;
    +      }
    +    } else {
    +      for (RelNode child : rel.getInputs()) {
    +        if (guessRows(child)) { // at least one child is a guess
    +          return true;
    +        }
    +      }
    +    }
    +    return false;
    +  }
    +
    +  private static boolean findLikeOrRangePredicate(RexNode predicate) {
    +    if ((predicate == null) || predicate.isAlwaysTrue()) {
    +      return false;
    +    }
    +    for (RexNode pred : RelOptUtil.conjunctions(predicate)) {
    +      for (RexNode orPred : RelOptUtil.disjunctions(pred)) {
    +        if (!orPred.isA(SqlKind.EQUALS) ||
    +             orPred.isA(SqlKind.LIKE)) {
    +          return true;
    +        }
    +      }
    +    }
    +    return false;
    +  }
    +
    +  public static boolean analyzeSimpleEquiJoin(Join join, int[] joinFieldOrdinals) {
    --- End diff --
    
    Done


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