add avg byte size in column statistics #19963
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Which issue does this PR close?
add avg byte size in column stats. This is just a first PR so kept scope small. Will follow up with more propagation and adding more support for different types.
this will help estimating cardinality thus planning in CBO and for distributed.
Mentioned in this point: "Output byte size estimation : rows * avg_row_width for network cost awareness (we discussed this offline, avg_row_width can be computed based on the row type and avg_len/avg_size for collections or length varying types)"