babelfish-for-postgresql / babelfish_extensions / 10727287549

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Add ALTER FUNCTION support in Babelfish (#2914)


This change adds support for ALTER FUNCTION syntax in Babelfish for functions and inline table valued functions. This commit does not include support for ALTER FUNCTION on multi-statement table valued functions. This commit builds off of the logic of ALTER PROCEDURE by adding support for return types and general function handling. AlterFunctionStmt are built in the parser, then we extract the relevent metadata to construct a new function. The OID and ACL of the original function remain the same.

Task: BABEL-4937
Signed-off-by: Jake Owen <owjco@amazon.com>

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