Ruben Q L created CALCITE-4055:
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Summary: RelFieldTrimmer loses hints
Key: CALCITE-4055
URL: https://issues.apache.org/jira/browse/CALCITE-4055
Project: Calcite
Issue Type: Bug
Components: core
Affects Versions: 1.23.0
Reporter: Ruben Q L
The trimmed plan generated by RelFieldTrimmer can lose the hints that might be
present in the input plan.
The issue can be reproduced with the following test (to be added to
RelFieldTrimmerTest):
{code:java}
@Test void testJoinWithHints() {
final RelHint noHashJoinHint =
RelHint.builder("NO_HASH_JOIN").inheritPath(0).build();
final RelBuilder builder = RelBuilder.create(config().build());
final RelNode original =
builder.scan("EMP")
.scan("DEPT")
.join(JoinRelType.INNER,
builder.equals(
builder.field(2, 0, "DEPTNO"),
builder.field(2, 1, "DEPTNO")))
.hints(noHashJoinHint)
.project(
builder.field("ENAME"),
builder.field("DNAME"))
.build();
final RelFieldTrimmer fieldTrimmer = new RelFieldTrimmer(null, builder);
final RelNode trimmed = fieldTrimmer.trim(original);
final String expected = ""
+ "LogicalProject(ENAME=[$1], DNAME=[$4])\n"
+ " LogicalJoin(condition=[=($2, $3)], joinType=[inner])\n"
+ " LogicalProject(EMPNO=[$0], ENAME=[$1], DEPTNO=[$7])\n"
+ " LogicalTableScan(table=[[scott, EMP]])\n"
+ " LogicalProject(DEPTNO=[$0], DNAME=[$1])\n"
+ " LogicalTableScan(table=[[scott, DEPT]])\n";
assertThat(trimmed, hasTree(expected));
assertTrue(original.getInput(0) instanceof Join);
final Join originalJoin = (Join) original.getInput(0);
assertTrue(originalJoin.getHints().contains(noHashJoinHint));
assertTrue(trimmed.getInput(0) instanceof Join);
final Join join = (Join) trimmed.getInput(0);
assertTrue(join.getHints().contains(noHashJoinHint));
}
{code}
which fails in the last line:
{{assertTrue(join.getHints().contains(noHashJoinHint));}}
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