stiga-huang c9d7bcb4a1
IMPALA-9661: Avoid introducing unused columns in table masking view ...
Previously, if a table has column masking policies, we replace its
unanalyzed TableRef with an analyzed InlineViewRef (table masking view)
in FromClause.analyze(). However, we can't detect which columns are
actually used in the original query at this point. In fact, analyze()
for SelectList, WhereClause, GroupByClause and other clauses containing
SlotRefs happen after FromClause.analyze(). After the whole query block
is analyzed, we can get the exact set of required columns.
This patch refactor the codes to do table masking after analyze() to
avoid introducing unused columns. Referenced columns of a TableRef are
registered in analyze(), which helps to figure out what columns are
actually needed.
With this, we don't need to revert table masking in FromClause.reset().
The doTableMasking flag in AST is also removed since now the table mask
is resolved once after analyze().
Tests:
- Add more e2e tests in test_ranger.py
- Run CORE tests
Change-Id: Ib015a8ab528065907b27fbdceb8e2818deb814e1
Reviewed-on: http://gerrit.cloudera.org:8080/17199
Reviewed-by: Aman Sinha <amsinha@cloudera.com >
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com >
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