v0.15.0

New Features

• sql/index/pilosa: implement negation indexes
• sql/analyzer: use indexes with 'NOT IN' expressions
• sql/plan: disallow indexes on blob and json columns
• add version() udf
• sql/expression/function/aggregation: allow conversion in AVG
• sql/analyzer: resolve ascend and descend indexes
• sqle: log query in debug

Performance improvements

• gitbase: compress keys using zlib
• sql/analyzer: add a rule to evaluate filters ahead of time

Bugfixing

• internal/rule: fix projections when squash joins
• cmd/gitbase: fix version and build info
• cmd/gitbase: remove -h flag as shortcut for --host
• gitbase: make squash iterators cancellable
• gitbase: fix bugs handling git errors
• sql/analyzer: remove unnecessary qualification of star
• sql/analyzer: fix resolveNaturalJoins rule to work properly with table aliases
• sql/analyzer: add a rule to reorder aggregations inside projections
• sql/parse: fix parsing when there are preceding spaces

Documentation

• docs: Add troubleshooting info about connecting with MySQL client 8.x
• docs: Add indexes section into the summary