Zhenglin Tao created HAWQ-1852:
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Summary: Fix find_udf
Key: HAWQ-1852
URL: https://issues.apache.org/jira/browse/HAWQ-1852
Project: Apache HAWQ
Issue Type: Bug
Components: Core
Reporter: Zhenglin Tao
Assignee: Ruilong Huo
If IsBuildInFunction returns false, then find_udf should return true
directly, which means that the statement contains UDF. Otherwise, it
should continue to recursively determine the args of FuncExpr through
expression_tree_walker, because FuncExpr may contain recursive calls.
For example, suppose "A" is an UDF, then "select A::text" meets this
situation. The outter FuncExpr is "text" and the inner FuncExpr is "A".
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