1.0.5:
  Incompatibilites:
    - Due to changes in pg_stat_statements in 11, queryid is now on 64 bits.
      SQL functions no longer use oid type but bigint for queryid attribute
      (even for PG prior to 11).
  Miscellaneous:
    - Add pg 11 compatibility (Adrien Nayrat helped by Julien Rouhaud
      and Thomas Reiss)
    - Warn if incorrect configuration setting is used
1.0.4:
    - Fix a bug in Bitmap Index Scan nodes handling for PostgreSQL 10+ (Fix by
      Julien Rouhaud, thanks to Marc Cousin and Adrien Nayrat for reporting the
      issue)
    - Fix sampled array buffer overflow (Fix by Julien Rouhaud, reporting and
      much testing by Nicolas Gollet)
1.0.3:
  Bugfix:
    - Fix a missing call to InstrEndLoop (Tomas Vondra)
    - Sample all nested queries when top level statement is sampled (Julien
      Rouhaud)
    - Make sure hash keys can be compared using memcmp (Julien Rouhaud)
    - Fix behavior with parallel queries (Julien Rouhaud based on a patch by
      Tomas Vondra)
    - Fix bug on TEXTCONST not being byval (Ronan Dunklau)
    - Fix 64bits counters on pass-by-ref float8 architectures (Julien Rouhaud)
    - Fix bug in pg_qualstats_names (Ronan Dunklau)
    - Fix bug in const position (Julien Rouhaud)
    - Fix pg_qualstats_pretty to use text instead of regoper, allowing usage of
      pg_upgrade when pg_qualstats is installed (Julien Rouhaud)
    - Fix segfault when interleaved executors cause bad sampling detection
      (Julien Rouhaud, reported by Andreas Seltenreich)
  Miscellaneous:
    - Add pg 10 compatibility (Julien Rouhaud)
    - Do not install docs anymore (Ronan Dunklau)
    - Add missing occurences/nbfiltered fields to pg_qualstats_pretty and
      pg_qualstats_all views (Julien Rouhaud)
1.0.2:
  Bugfix
    - Fix infinite loop for queries having a huge number of WHERE or JOIN
      clauses
1.0.1:
  Bugfix
    - Fix impossibility to install pg_qualstats if intarray extension is
      installed
1.0.0:
  Incompatibilites:
    - RenameGUC from sample_ratio to sample_rate
  Bugfix:
    - only get the exclusive lock on shared memory when needed
    - Fix bugs related to outer var resolution
    - Add missing function prototype
  Miscellaneous:
    - Add 9.6 compatibility
    - Code and comment cleanup
  Thanks to Thomas Vondra and Julien Rouhaud !
0.0.9:
  - add sample_ratio hook
  - fix mistake while releasing 0.0.8
0.0.8:
  - add sample_ratio parameter
0.0.7:
  - fix counters for 32 bits builds
  - handle different collations for constants sampling
  - add a new "occurences" field, displaying the number of qual call
  - keep a unnormalized query string for each queryid
  - fix a bug with operator id retrieval
  - handles casts
  - add stats collection for nestedloops
  - handle FuncExpr and MinMaxExpr
  - improve performances for queries having multiple quals
0.0.6:
  - order quals and constants by their text positions.
  - fix bug with Index-Only Scans, which where not correctly supported
  - make pg_config configurable from the make invocation
  - ensure pg_qualstats is in shared_preload_libraries
0.0.5:
  - fix bug with = ANY(NULL) expressions
0.0.4:
 - add inline documentation in the sql script
 - fix a bug with 32bits builds (thanks to Alain Delorme for reporting it)