mihaibudiu commented on code in PR #4332:
URL: https://github.com/apache/calcite/pull/4332#discussion_r2067487711
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core/src/main/java/org/apache/calcite/sql2rel/RelDecorrelator.java:
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@@ -3201,6 +3212,61 @@ assert allLessThan(this.oldToNewOutputs.values(),
}
}
+ /**
+ * Check if the field at the given index is non-nullable.
+ *
+ * <p>This method performs a basic check for `null` values in the field.
However, a
+ * `false` result does not necessarily mean that the field contains `null`
values.
+ * It only guarantees that if the result is `true`, the field contains no
`null` values.
+ */
+ private static boolean isFilterNull(RelNode rel, int index) {
Review Comment:
I would call the function 'isFieldNullable`. Same for the recursive version.
If this method returns 'true', the field is certainly nullable. If the
method returns 'false', the field may or may not be nullable.
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