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Collect relation-level stats during compression
During compression, column min/max stats are collected on a per-segment basis for orderby columns and those that have indexes. This change uses the same mechanism to collect relation-level min/max stats to be used by chunk skipping. This avoids, in worst case, an extra full table scan to gather these chunk column stats. For simplicity, stats gathering is enabled for all columns that can support it, even though a column might not use neither segment-level stats nor relation-level (chunk column) stats. The overhead of collecting min/max values should be negligible.
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