Gabor Kaszab has uploaded this change for review. ( 
http://gerrit.cloudera.org:8080/14291


Change subject: IMPALA-8704: ISO:SQL:2016 datetime patterns - Milestone 2
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IMPALA-8704: ISO:SQL:2016 datetime patterns - Milestone 2

This patch adds additional datetime format tokens on top of what was
introduced with Milestone 1 (IMPALA-8703).

The tokens introduced:
- Free text token: Surrounded by double quotes, a free text section
  can be given in the format where the same text is expected in the
  input without the surrounding double quotes.
- FX modifier: This modifier has to be given at the beginning of the
  format and is valid for the whole format.
  In a string to datetime conversion this forces strict separator
  matching and expects all the tokens in the input to have the same
  length as their maximum length. E.g. A month has to be of length 2
  prefixed by zero if needed.
  This is the default in a datetime to string conversion.
- FM modifier: This modifier affects only the following token and
  overrides the FX modifier. Using this the value of a token can be
  shorter than the max length if followed by a separator.
  E.g. 1-digit month, less than 4-digit year, etc. This is the
  default behaviour in a string to datetime conversion.

Change-Id: I30d2f6656054371476aaa8bd0d51f572b9369855
---
M be/src/runtime/date-parse-util.cc
M be/src/runtime/datetime-iso-sql-format-parser.cc
M be/src/runtime/datetime-iso-sql-format-parser.h
M be/src/runtime/datetime-iso-sql-format-tokenizer.cc
M be/src/runtime/datetime-iso-sql-format-tokenizer.h
M be/src/runtime/datetime-parser-common.cc
M be/src/runtime/datetime-parser-common.h
M be/src/runtime/timestamp-parse-util.cc
M tests/query_test/test_cast_with_format.py
9 files changed, 473 insertions(+), 40 deletions(-)



  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/91/14291/1
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I30d2f6656054371476aaa8bd0d51f572b9369855
Gerrit-Change-Number: 14291
Gerrit-PatchSet: 1
Gerrit-Owner: Gabor Kaszab <gaborkas...@cloudera.com>

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