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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