Erik Nordström 2e7b32cd91 Add WARNING when doing min-max heap scan for adaptive chunking
Adaptive chunking uses the min and max value of previous chunks
to estimate their "fill factor". Ideally, min and max should be
retreived using an index, but if no index exists we fall back
to a heap scan. A heap scan can be very expensive, so we now
raise a WARNING if no index exists.

This change also renames set_adaptive_chunk_sizing() to simply
set_adaptive_chunking().
2018-08-08 17:01:31 +02:00
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