hyrise/hyrise — pull request #131 by kateyy (2013-06-26 21:48:04+00:00)
Title: Default dict vector

Add new column type to store data which is mostly equal to a default value (about 95% of defaults).
A bit vector stores which lines hold default/non-default value. Exception values are obtained by searching the row number in a position list and getting the value from a second vector.

Needs changes in loader and table interfaces to allow settings the new column type.
Add also a plan operation to set per column whether to use default dict.