Optimizations for row_number() window functions
Fix CROSS JOIN bug

Fixes #1548
Fix decomposable flag in AggregationCompiler
Fix parsing of UNION

Previously SELECT 123 UNION DISTINCT SELECT 123 UNION ALL SELECT 123 was
parsed as SELECT 123 UNION DISTINCT SELECT 123 UNION DISTINCT SELECT 123
Add test query for previously broken UNION query
Fix parsing of INTERSECT
Increase test timeout to 60secs to resolve random failures
Move accumulator state size to a static constant
Remove unnecessary parameter documentation
Fix trailing whitespace
Cleanup TABLESAMPLE documentation
Update documentation for SELECT
Cleanup source for color function documentation
Update SPI documentation
Exclude REST documentation

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