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This patch: 1. Removes the option to declare uncompressed columns (set columnstore_compression_type = 0). 2. Ignores [COMMENT '[compression=0] option at table or column level (no error messages, just disregard). 3. Removes the option to set more than 2 extents per file (ExtentsPreSegmentFile). 4. Updates rebuildEM tool to support up to 10 dictionary extent per dictionary segment file. 5. Adds check for `DBRootStorageType` for rebuildEM tool. 6. Renamed rebuildEM to mcsRebuildEM.