julianhyde commented on code in PR #3167:
URL: https://github.com/apache/calcite/pull/3167#discussion_r1187827849
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core/src/main/java/org/apache/calcite/adapter/enumerable/RexImpTable.java:
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@@ -3090,6 +3102,13 @@ private static class ItemImplementor extends
AbstractRexCallImplementor {
final RexCall call, final List<Expression> argValueList) {
final MethodImplementor implementor =
getImplementor(call.getOperands().get(0).getType().getSqlTypeName());
+ // If the structure is an array, two additional arguments are added to
the argValueList
+ // to denote what the offset is and what the behavior should be if the
index is out of boudns.
+ if (implementor.method.getName().equals("arrayItemOptional")) {
Review Comment:
Hard-coded method names are too fragile.
Especially strange given that getImplementor returns
BuiltInMethod.ARRAY_ITEM and there's no BuiltInMethod.ARRAY_ITEM_OPTIONAL.
Reading this code, I first thought it was because of the 'optional'. But
actually it's because it's an array.
So, figure out a way to make this code more robust and intuitive. It's not
sufficient that it works.
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