Aron Hamvas created HIVE-22578:
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Summary: CBO genOPTree is not failsafe for CTAS and VIEW statements
Key: HIVE-22578
URL: https://issues.apache.org/jira/browse/HIVE-22578
Project: Hive
Issue Type: Bug
Components: CBO
Affects Versions: 3.1.2
Reporter: Aron Hamvas
Assignee: Aron Hamvas
If CBO fails during OT generation, it is supposed to skip CBO and fall back to
SemanticAnalyzer generating the OT for the original AST. However, for CTAS and
VIEW statements, the original AST is discarded and replaced with the new AST.
If OT generation for the new AST fails with a SemanticException, the
compilation is destined to fail completely since we cannot fall back to the
original and possibly valid AST.
Also, the SemanticException sometimes gets hidden and misjudged as a missing
column statistics issue due to bad error handling.
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