histograms → sql-common Relation

File in sql/histograms	Includes file in sql-common
equi_height.cc	json_dom.h
equi_height_bucket.cc	json_dom.h
equi_height_bucket.cc	my_decimal.h
equi_height_bucket.h	my_decimal.h
histogram.cc	json_dom.h
histogram.cc	my_decimal.h
singleton.cc	json_dom.h
singleton.h	my_decimal.h
value_map.cc	my_decimal.h