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[jira] [Created] (CALCITE-2673) SqlDialect supports pushing of all functions by default

Jesus Camacho Rodriguez created CALCITE-2673:

             Summary: SqlDialect supports pushing of all functions by default
                 Key: CALCITE-2673
                 URL: https://issues.apache.org/jira/browse/CALCITE-2673
             Project: Calcite
          Issue Type: Improvement
          Components: core
            Reporter: Jesus Camacho Rodriguez
            Assignee: Jesus Camacho Rodriguez
             Fix For: 1.18.0

SqlDialect contains a 'supportsFunction' that can be used by rules to know whether a certain function is supported in the given dialect, e.g., to choose whether to push a Filter expression to JDBC, etc.
The default implementation of 'supportsFunction' always returns true.
I believe a better idea would be to support in the default implementation for the method the most common SQL functions. Then each dialect can override that behavior and expand/limit the supported functions, e.g., JethroDataDialect already does that.

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