shenyu0127 commented on code in PR #11188:
URL: https://github.com/apache/pinot/pull/11188#discussion_r1278232062
##########
pinot-common/src/main/java/org/apache/pinot/sql/parsers/CalciteSqlParser.java:
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@@ -267,6 +270,35 @@ private static void validateDistinctQuery(PinotQuery
pinotQuery)
}
}
+ /*
+ * Throws an exception if the filter's rhs has NULL because:
+ * - Predicate evaluator and pruning do not have NULL support.
+ * - It is not meaningful to have NULL in the filter's rhs.
+ * - For most of the filters (e.g. GREATER_THAN, LIKE), the rhs being NULL
leads to no record matched.
+ * - For IN, adding NULL to the rhs list does not change the matched
records.
+ * - For NOT IN, adding NULL to the rhs list leads to no record matched.
+ * - For "= NULL" and "!= NULL", we have the IS_NULL and IS_NOT_NULL as
workarounds.
Review Comment:
You are right. Corrected the function comment.
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