julianhyde commented on code in PR #3984:
URL: https://github.com/apache/calcite/pull/3984#discussion_r1806915759
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core/src/main/java/org/apache/calcite/sql/validate/SqlValidatorImpl.java:
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@@ -1217,12 +1219,21 @@ protected void validateNamespace(final
SqlValidatorNamespace namespace,
// fields; these are neutralized if the consuming query filters on
them.
final ImmutableBitSet mustFilterFields =
namespace.getMustFilterFields();
- if (!mustFilterFields.isEmpty()) {
+ // Remnant must filter fields are fields that are not selected and
cannot
Review Comment:
I see. If `t` has a must-filter field `f` and bypass fields `b0` and `b1`,
then the query `select b0, b1 from t` has no must-filter fields, no bypass
fields, but two remnant fields `[b0, b1]`.
If you filter on any of those remnant fields then they all go away.
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