[Impala-ASF-CR] PREVIEW: IMPALA-3437: DECIMAL V2: avoid implicit decimal->double conversion

["Tim Armstrong (Code Review)" <ge...@cloudera.org>]

Tim Armstrong has uploaded a new patch set (#3).

Change subject: PREVIEW: IMPALA-3437: DECIMAL_V2: avoid implicit decimal->double conversion
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PREVIEW: IMPALA-3437: DECIMAL_V2: avoid implicit decimal->double conversion

This changes the behaviour of applying an arithmetic operator to
constant DECIMAL and non-DECIMAL arguments. In DECIMAL_V1, this
caused an implicit conversion to floating point, which caused
users a lot of confusion in some cases. In DECIMAL_V2 the typing
rules are simplified: constant decimals are treated the same as any
other decimals.

Testing:
Added some expression tests for different arithmetic operators
and binary predicates (the two Expr subclasses that call
convertNumericLiteralsFromDecimal()).

Extended analyzer tests to test DECIMAL_V2 behaviour.

Ran core tests.

TODO: add tests for scientific notation to address coverage gap

Change-Id: Ie419a75784eec2294947103e6e1465dfadfc29da
---
M be/src/exprs/expr-test.cc
M fe/src/main/java/org/apache/impala/analysis/Expr.java
M fe/src/test/java/org/apache/impala/analysis/AnalyzeExprsTest.java
3 files changed, 130 insertions(+), 47 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/16/7916/3
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ie419a75784eec2294947103e6e1465dfadfc29da
Gerrit-PatchSet: 3
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Tim Armstrong <ta...@cloudera.com>