Add condition pushdowns to the information_schema tables to give a
performance improvement when a relevant WHERE condition is provided. In
addition there is a new table_usage() stored procedure designed to use
the pushdowns.
* COLUMNSTORE_EXTENTS data_size now shows the total size on the highest
segment of an extent file. It also shows 0 bytes if HWM is zero so that
if there is more than one segment it doesn't show 8192 bytes for the
lower segments.
* COMPRESSION_RATIO was missing some data and using compressed data size
instead of file size (which is probably more realistic).
* Add INFORMATION_SCHEMA.COLUMNSTORE_FILES which contains information
about files
* Remove file information from COLUMNSTORE_EXTENTS (due to above)
* Hide columns with Object ID < 3000 (internal columns)
* Fix bad calculation in data_size columns
* Fix minor memory leak
* Add compressedSize() function to IDBFileSystem to get the used file
size for a compressed file
* Add columnstore_info schema with utility stored procedures to access
the information_schema tables
This patch does the following:
* Fix a year storage issue in the datestamp for the columnstore tables
metadata table (note that any previous tables will still have the
incorrect year stored).
* Expose the table creation date in CalpontSystemCatalog::getTables()
* Add an INFORMATION_SCHEMA table listing the tables in ColumnStore
(similar to systable)
* Add an INFORMATION_SCHEMA table listing the columns in ColumnStore
(similar to syscolumn)
* Add an INFORMATION_SCHEMA table listing the extents in ColumnStore
(similar to the editem tool but with additional file information)
* Modifies the build system and scripts to support the new tables
