Jingsong Lee created FLINK-15595:

             Summary: Resolution Order is chaotic not FLIP-68 defined
                 Key: FLINK-15595
                 URL: https://issues.apache.org/jira/browse/FLINK-15595
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / API
            Reporter: Jingsong Lee
             Fix For: 1.10.0

First of all, the implementation is problematic. CoreModule returns 
BuiltinFunctionDefinition, which cannot be resolved in 
FunctionCatalogOperatorTable, so it will fall back to FlinkSqlOperatorTable.

Second, the function defined by CoreModule is seriously incomplete. You can 
compare it with FunctionCatalogOperatorTable, a lot less.

We should:
 * We should resolve BuiltinFunctionDefinition correctly in 
 * CoreModule should contains all functions in FlinkSqlOperatorTable, a simple 
way could provided calcite wrapper to wrap all functions.
 * PlannerContext.getBuiltinSqlOperatorTable should not contains 
FlinkSqlOperatorTable, we should use one 
FunctionCatalogOperatorTable.Otherwise, there will be a lot of confusion.

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