Lino Rosa created CALCITE-6776:
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Summary: Multiple expanded `IS NOT DISTINCT FROM` cannot be
collapsed back
Key: CALCITE-6776
URL: https://issues.apache.org/jira/browse/CALCITE-6776
Project: Calcite
Issue Type: Bug
Reporter: Lino Rosa
Assignee: Lino Rosa
When a query has multiple `IS NOT DISTINCT FROM` operations, the resulting
query won't collapse them back and keeps them in expanded form.
For example:
{code:java}
left.A IS NOT DISTINCT FROM right.A AND
left.B IS NOT DISTINCT FROM right.B{code}
will become:
{code:java}
(left.A IS NULL AND right.A IS NULL) OR (left.A = right.A)) AND
(left.B IS NULL AND right.B IS NULL) OR (left.B = right.B)) {code}
This is particularly a problem with Spark, where the presence of the {{OR}}
will result in a {{BroadcastLoopJoin}} and derail the query execution.
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