Sven Klemm 45a7abc4de Improve DecompressChunk qual pushdown
Allow pushdown of RelabelType expressions into the scan below the
DecompressChunk node. When using varchar columns as segmentby
columns constraints on those columns would not be pushed down
because postgres would inject RelabelType nodes that where not
accepted as valid expression for pushdown leading to bad performance
because the filter could only be applied after decompression.

Fixes #3351
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