Will Noble created CALCITE-5635:
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Summary: Consult type mappings when coercing types.
Key: CALCITE-5635
URL: https://issues.apache.org/jira/browse/CALCITE-5635
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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