Ruben Q L created CALCITE-3953:
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Summary: SqlToRelConverter creates char literal with coercibility
IMPLICIT
Key: CALCITE-3953
URL: https://issues.apache.org/jira/browse/CALCITE-3953
Project: Calcite
Issue Type: Bug
Components: core
Affects Versions: 1.22.0
Reporter: Ruben Q L
The problem can be reproduced with the following test (to be added in
SqlToRelConverterTest):
{code:java}
@Test void testLiteralCoercibility() {
final String sql = "select * from dept where name = 'abc'";
final RelNode rel = tester.convertSqlToRel(sql).rel;
final List<LogicalFilter> filters = new ArrayList<>();
final RelShuttleImpl visitor = new RelShuttleImpl() {
@Override public RelNode visit(LogicalFilter filter) {
filters.add(filter);
return super.visit(filter);
}
};
visitor.visit(rel);
assertThat(filters.size(), is(1));
assertThat(filters.get(0).getCondition(), instanceOf(RexCall.class));
RexCall call = (RexCall) filters.get(0).getCondition();
RexNode literal =
call.getOperands().stream().filter(RexLiteral.class::isInstance).findFirst().orElse(null);
assertThat (literal, notNullValue());
assertThat (literal.getType().getCollation(), notNullValue());
assertThat (literal.getType().getCollation().getCoercibility(),
is(SqlCollation.Coercibility.COERCIBLE));
}
{code}
Which fails with the message:
{code:java}
java.lang.AssertionError:
Expected: is <COERCIBLE>
but: was <IMPLICIT>
{code}
According to {{SqlCollation.Coercibility}} javadoc:
_A character value expression consisting of a value other than a column (e.g.,
a host variable or a literal) has the coercibility characteristic Coercible,
with the default collation for its character repertoire._
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