lp:~tsarev/percona-server/5.1_fix_bug_856404

Created by Oleg Tsarev on 2011-12-17 and last modified on 2011-12-17
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413. By Oleg Tsarev on 2011-12-17

  Add tests:
    * select */* a comment \*/from t1;
    * select *# a comment \\\nfrom t1;
    * select *-- a comment \\\nfrom t1
    * select "\\\\"" /* not a comment */" from t1;
    * select "\\\\"" /*! not a comment */" from t1;

  Behavior was incorrect:
    * backslash-backslash-quote processed incorrectly (as backslash-quote)
    * backslash-star-slash processed incorrectly (as part of comment)
    * backslash inside comments and quotes` (this is also related to bugs #856404 and #705688 - go out arrays bound and memory corruption as result).

  Refactoring of query comments remover and cacheable query detector.
This changes simplify the query-cache-strip-comments option implementation and avoid future bugs.
  1) Rename class Query_Cache_Strip_Comments to Query_Without_Comments
  2) Fix bug inside "set" method: while I am allocating buffer for striped query I forgot about \0 in the end of query. After that memory is corrupted. This is related to bugs #856404 and #705688.
  3) Change logic of "set" inside Query_Without_Comments method - now thd->db_length used instead of sum "thd->db_length + 1 + QUERY_CACHE_FLAGS_SIZE"
  4) rename members of class Query_Cache_Strip_Comments: lenght => q_length, buffer_length => b_length
  5) Move class Query_Without_Comments (old Query_Cache_Strip_Comments) from file sql/query_cache_strip_comments.h to sql/sql_class.h. Move implementation of class's methods from sql_cache.cc to sql_class.cc
  6) Change interface of Query_Without_Comments - now this is just smart memory (re)allocation and memory free, without any logic of comment striping
  7) Remove file query_cache_strip_comments.h
  8) Remove class Query_Cache_Strip_Comments_Backup to Comments_Processor. Add logic of comments striping (from removed class Query_Cache_Strip_Comments).
  Add logic for check cacheability of query.
  9) Enum query_comments_parser::Kind. Describe part of query by following kinds:
   * Empty - end of query, empty query
   * Comment - single-line / multiline comments
   * WhiteSpace - space, tab, new line, carriage return
   * Special - part of query, which can be BEFORE the SELECT keyword in normal SELECT query (required for cacheable query detection) - WhiteSpace, Comment, or bracets ('(' and ')').
   * Another - any part of query except Special.
  10) Function query_comments_parser::analyze. Detect type of first part of query, return kind and pointer to begin/end
  11) Function query_comments_parser::remove_comments_from_query. Function remove all comments. Implemented using analyze. Function after remove some comment insert ' ' for avoid incorrect result. All sequences of whitespaces without another symbols replaced by single ' ' (including space which replaced the comment).
  12) Function query_comments_parses::skip_not_another - skip prefix before Another symbols (function hopes: first not another - SELECT. SELECT or not (cacheable or not) will checked immediately after funciton call).
  13) Function query_comments_parses::skip_defauls - default MySQL behavior - skip all open bracets ('('). Check for SELECT or not immediately after function call.
  Also fixed guard defines in it: from "_SQL_QUERY_STRIPC_COMMENTS_H_" to "_SQL_QUERY_CACHE_STRIP_COMMENTS_H_"
  14) Fixed header of query_cache_enhance.patch:
  from "query_cache_with_comments.patch" to "query_cache_enhance.patch"
  15) Little optimisation for '...''...' and "...""..."
  16) Change the memory allocation size - from 5.1.60 size is "(query_length + 1) + sizeof(size_t) + db_length + QUERY_CACHE_FLAGS_SIZE" instead of "(query_length + 1) + db_length + 1 + QUERY_CACHE_FLAGS_SIZE".
  Now query after \0 has also database length

410. By Stewart Smith on 2011-11-29

fix version number in Makefile

409. By Stewart Smith on 2011-11-24

merge makefile fix

408. By Stewart Smith on 2011-11-24

port Percona Server 5.1 to MySQL 5.1.60 base

407. By Stewart Smith on 2011-11-24

remove now unneeded patches as we're part of a happy bzr tree

406. By Stewart Smith on 2011-11-24

fix Makefile for building Percona Server as bzr brancH

405. By Stewart Smith on 2011-11-24

Import Percona Server patch: bug45702.patch

404. By Stewart Smith on 2011-11-24

Import Percona Server patch: bug860910.patch

# name : bug860910.patch
# maintainer : Alexey
#
# Fixes LP bug #860910 / MySQL bug #62557
#

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