3 Commits

Author	SHA1	Message	Date
Matvey Arye	0f3e74215a	Split segment meta min_max into two columns ... This simplifies the code and the access to the min/max metadata. Before we used a custom type, but now the min/max are just the same type as the underlying column and stored as two columns. This also removes the custom type that was used before.	2019-10-29 19:02:58 -04:00
Matvey Arye	2bf97e452d	Push down quals to segment meta columns ... This commit pushes down quals or order_by columns to make use of the SegmentMetaMinMax objects. Namely =,<,<=,>,>= quals can now be pushed down. We also remove filters from decompress node for quals that have been pushed down and don't need a recheck. This commit also changes tests to add more segment by and order-by columns. Finally, we rename segment meta accessor functions to be smaller	2019-10-29 19:02:58 -04:00
Matvey Arye	b9674600ae	Add segment meta min/max ... Add the type for min/max segment meta object. Segment metadata objects keep metadata about data in segments (compressed rows). The min/max variant keeps the min and max values inside the compressed object. It will be used on compression order by columns to allow queries that have quals on those columns to be able to exclude entire segments if no uncompressed rows in the segment may match the qual. We also add generalized infrastructure for datum serialization / deserialization for arbitrary types to and from memory as well as binary strings.	2019-10-29 19:02:58 -04:00