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Compression always defaulting to LZW, used to default to row diff compression

Description

An unintentional change since the 1st version of OSS, has meant that compressed files (spills, persists) have always used LZW.
Previously in 702, if the row size was fixed length, row diff compression was used instead.

The default LZW compression appears to be ~ 3x slower than row-diff compression, so it has meant on systems and queries where compression is the bottleneck it significantly slows down those subgraphs.
However, LZW does usually achieve high compression ratio's.

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Jacob Cobbett-Smith March 6, 2015 at 11:20 AM

- set target to 5.0.6 for now, needs a JIRA 5.0.8 target

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Created March 6, 2015 at 10:25 AM
Updated March 9, 2015 at 1:52 PM
Resolved March 9, 2015 at 1:52 PM