seancxmao opened a new pull request #1615: [CALCITE-3547] SqlValidatorException because Planner cannot find UDFs added to schema URL: https://github.com/apache/calcite/pull/1615 `CalciteSqlValidator` inside `PlannerImpl` only looks for UDFs in `SqlStdOperatorTable`. When an UDF is added to schema, it is not available for searching by the validator. This PR aims to let UDFs in schema available to the validator just like what `CalcitePrepareImpl` does. * Add `SqlStdOperatorTable` and `CalciteCatalogReader` to `ChainedSqlOperatorTable`, which then available to `CalciteSqlValidator` * Add a test case in `PlannerTest` (`testValidateUserDefinedFunctionInSchema`)
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