danny0405 opened a new pull request #1497: [CALCITE-3379] Support expand STRING column expression of table durin… URL: https://github.com/apache/calcite/pull/1497 …g sql-to-rel conversion * Add a default implementation in InitializerContext to support parsing string column expression * Add a hook function interface in InitializerExpressionFactory to let user customized the node transformation right after the column expression conversion * In SqlToRelConverter#toRel, remove the lazy initialization logic for Blackboard instance because the Java8 Supplier does not have memorization
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