[jira] [Created] (CALCITE-5636) Consult type mappings when coercing types.

["Will Noble (Jira)" <ji...@apache.org>]

Will Noble created CALCITE-5636:
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             Summary: Consult type mappings when coercing types.
                 Key: CALCITE-5636
                 URL: https://issues.apache.org/jira/browse/CALCITE-5636
             Project: Calcite
          Issue Type: Improvement
          Components: core
            Reporter: Will Noble


This is another offshoot of CALCITE-5346.

In [{{AbstractTypeCoercion.implicitCast}}|https://github.com/apache/calcite/blob/2dba40e7a0a5651eac5a30d9e0a72f178bd9bff2/core/src/main/java/org/apache/calcite/sql/validate/implicit/AbstractTypeCoercion.java#L713], Calcite may insert {{CAST}} invocations disregarding the root schema type map. This happens during the validation phase, so it's easy enough to read the type map directly in the {{AbstractTypeCoercion}} utility, although it's hard to say if this is an optimal solution. It may make sense to incorporate the type map into the {{RelDataTypeSystem}} which is more widely available in non-validation phases of SQL processing pipelines.



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