zabetak commented on code in PR #3852:
URL: https://github.com/apache/hive/pull/3852#discussion_r1072444905
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ql/src/test/results/clientpositive/llap/lvj_mapjoin.q.out:
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@@ -121,7 +121,6 @@ STAGE PLANS:
TableScan
alias: expod1
filterExpr: aid is not null (type: boolean)
- probeDecodeDetails: cacheKey:HASH_MAP_MAPJOIN_39_container,
bigKeyColName:aid, smallTablePos:1, keyRatio:1.0
Review Comment:
The probe decode optimization relies on the presence of semijoins
(https://github.com/apache/hive/blob/5f57814ed743a411c8fa7c647c24c98461271fe3/ql/src/java/org/apache/hadoop/hive/ql/parse/TezCompiler.java#L1401).
Semijoins depend on the `SyntheticJoinPredicate` transformation thus probe
decode depends transitively on `SyntheticJoinPredicate`.
This PR disables `SyntheticJoinPredicate` transformation for branches with
lateral views (present in `lvj_mapjoin.q` test) thus semijoins are not
considered and neither probe decode.
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