korowa opened a new pull request, #2262:
URL: https://github.com/apache/arrow-datafusion/pull/2262
# Which issue does this PR close?
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Closes #2221 .
# Rationale for this change
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At this moment approx_median -> approx_percentile_cont occurs in one of
optimization rules which kind of breaks logical plan (expressions inside of
aggregate step don't match its output schema) and it works fine in case of one
optimizer pass, but while second optimizer pass projection_push_down rule
cleans up approximate_percentile_cont.
# What changes are included in this PR?
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Suggestion is to move function replacement to planning phase - it seems to
be more appropriate (we don't actually need the whole execution plan for this,
because it's just rewriting of single expression), and there is no need to
adjust all aliases / projections / schemas while optimization phase.
# Are there any user-facing changes?
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Fixed execution of queries with approx_median aggregate expression / window
function / having filter.
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