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[CALCITE-3711] Correlate should override estimateRowCount #1726

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Jan 6, 2020
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[CALCITE-3711] Correlate should override estimateRowCount #1726

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11 changes: 11 additions & 0 deletions core/src/main/java/org/apache/calcite/rel/core/Correlate.java
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Original file line number Diff line number Diff line change
Expand Up @@ -188,6 +188,17 @@ public ImmutableBitSet getRequiredColumns() {
return ImmutableSet.of(correlationId);
}

@Override public double estimateRowCount(RelMetadataQuery mq) {
double leftRowCount = mq.getRowCount(left);
switch (joinType) {
case SEMI:
case ANTI:
return leftRowCount;
default:
return leftRowCount * mq.getRowCount(right);
}
}

@Override public RelOptCost computeSelfCost(RelOptPlanner planner,
RelMetadataQuery mq) {
double rowCount = mq.getRowCount(this);
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