Krisztian Kasa created CALCITE-6513:
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Summary: FilterProjectTransposeRule may cause OOM when Project
expressions are complex
Key: CALCITE-6513
URL: https://issues.apache.org/jira/browse/CALCITE-6513
Project: Calcite
Issue Type: Bug
Components: core
Reporter: Krisztian Kasa
Assignee: Krisztian Kasa
CALCITE-3774 addresses preventing merging projects when the resulting
expressions in the merged project are too complex and lead to slow compilation
or out of memory.
However, when there is a {{Filter}} on top of the {{Projects}} with a predicate
referencing the complex expressions {{FilterProjectTransposeRule}} tries to
push down the {{Filter}} below the bottom {{Project}} merging the expressions
and causing OOM.
The issue was initially reproduced using Hive with the Hive version of
{{FilterProjectTransposeRule}}. See: HIVE-28264
Calcite is also affected:
[https://github.com/kasakrisz/calcite/commit/b35a02f368624a9c4768f348cd072a95ed6de3e1]
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