chunweilei commented on a change in pull request #2598:
URL: https://github.com/apache/calcite/pull/2598#discussion_r744410275
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File path:
core/src/main/java/org/apache/calcite/sql2rel/StandardConvertletTable.java
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@@ -308,12 +308,20 @@ private static RexNode convertNvl(SqlRexContext cx,
SqlCall call) {
cx.convertExpression(call.getOperandList().get(1));
final RelDataType type =
cx.getValidator().getValidatedNodeType(call);
+ // Preserve Operand Nullability
return rexBuilder.makeCall(type, SqlStdOperatorTable.CASE,
ImmutableList.of(
rexBuilder.makeCall(SqlStdOperatorTable.IS_NOT_NULL,
operand0),
- rexBuilder.makeCast(type, operand0),
- rexBuilder.makeCast(type, operand1)));
+ rexBuilder.makeCast(
+ cx.getTypeFactory()
+ .createTypeWithNullability(type,
operand0.getType().isNullable()),
+ operand0),
+ rexBuilder.makeCast(
+ cx.getTypeFactory()
Review comment:
I agree that operand1 should keep its nullability. But operand0 would be
not nullable after rewrite.
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