Thomas Tauber-Marshall 4b486b0f90 IMPALA-1861: Simplify conditionals with constant conditions ...

When there are conditionals with constant values of TRUE or
FALSE we can simplify them during analysis using the ExprRewriter.

This patch introduces the SimplifyConditionalsRule with covers IF,
OR, AND, CASE, and DECODE.

It also introduces NormalizeExprsRule which normalizes AND and OR
such that if either child is a BoolLiteral, then the left child is a
BoolLiteral.

Testing:
- Added unit tests to ExprRewriteRulesTest.
- Added functional tests to expr.test
- Ran FE planner tests and BE expr-test.

Change-Id: Id70aaf9fd99f64bd98175b7e2dbba28f350e7d3b
Reviewed-on: http://gerrit.cloudera.org:8080/5585
Reviewed-by: Jim Apple <jbapple-impala@apache.org>
Tested-by: Impala Public Jenkins

2017-01-24 03:22:08 +00:00

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main

IMPALA-1861: Simplify conditionals with constant conditions

2017-01-24 03:22:08 +00:00

test

IMPALA-1861: Simplify conditionals with constant conditions

2017-01-24 03:22:08 +00:00