Frank Chen created CALCITE-7807:
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Summary: Reuse unchanged SQL types during least-restrictive
inference
Key: CALCITE-7807
URL: https://issues.apache.org/jira/browse/CALCITE-7807
Project: Calcite
Issue Type: Sub-task
Reporter: Frank Chen
Large string ARRAY validation repeatedly combines compatible character types.
The least-restrictive path may call createTypeWithCharsetAndCollation even when
the current immutable BasicSqlType already has the requested charset and
collation.
Return the existing BasicSqlType immediately when the requested charset and
collation are unchanged. Requests that change either attribute retain the
existing construction and canonicalization path.
The isolated Druid benchmark reduced allocation by 9.05% at 100,000 string
literals and 8.72% at 1,000,000 string literals.
Pull request: [PR #5281|https://github.com/apache/calcite/pull/5281]
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