Add number of tuples to client output
Add min/max/distinct stats for decimal values
WIP: Support for decimal columns
Fix bug in for numeric cols
fixed bug: use own implementation of list_difference to avoid side affects
bug fix in the difference implementation for the bug fix :)
support more node types for invalidating statistics
we can handle select * with selection condition
Merge branch 'selection_handler' into piggyback_master
Merge branch 'piggyback_master' into incrementalFD

Conflicts:
	src/backend/executor/execProcnode.c