Jesus Camacho Rodriguez created CALCITE-2192:
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Summary: RelBuilder might skip creation of Aggregate though it has
a column pruning effect
Key: CALCITE-2192
URL: https://issues.apache.org/jira/browse/CALCITE-2192
Project: Calcite
Issue Type: Bug
Components: core
Reporter: Jesus Camacho Rodriguez
Assignee: Jesus Camacho Rodriguez
Fix For: 1.16.0
Issue can be reproduced with following test:
{code:java}
@Test public void testAggregate3() {
final RelBuilder builder = RelBuilder.create(config().build());
RelNode root =
builder.scan("EMP")
.aggregate(
builder.groupKey(builder.field(1)),
builder.aggregateCall(SqlStdOperatorTable.COUNT, false, false,
null, "C"))
.aggregate(
builder.groupKey(builder.field(0)))
.build();
assertThat(str(root),
is(""
+ "LogicalProject(ENAME=[$0])\n"
+ " LogicalAggregate(group=[{1}], C=[COUNT()])\n"
+ " LogicalTableScan(table=[[scott, EMP]])\n"));
}
{code}
Without fix, builder will generate following plan, which contains an
unnecessary field (in Hive, this results in an assertion error in
RelFieldTrimmer):
{code:java}
LogicalAggregate(group=[{1}], C=[COUNT()])
LogicalTableScan(table=[[scott, EMP]])
{code}
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