colexec: fix usage of incorrect type schema for external hash agg #63446
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We recently merged a change to the external hash aggregator to maintain
ordering. This was done by planning an explicit sort after aggregation.
However, a bug was introduced in which we were using the incorrect type
schema for sort planning: namely, we used the "result types" for the
aggregator stage (after a projection is applied), but we should have
used the "output types" (the schema of what the aggregator outputs). Now
this is fixed.
Fixes: #63430.
Fixes: #63431.
Fixes: #63432.
Fixes: #63433.
Fixes: #63434.
Fixes: #63435.
Fixes: #63436.
Fixes: #63437.
Fixes: #63438.
Fixes: #63439.
Fixes: #63440.
Fixes: #63441.
Fixes: #63442.
Fixes: #63443.
Release note: None