Simple table reduction uses window operation instead of aggregation

Actual behaviour

import ibis
t = ibis.table([('e', 'int64'), ('f', 'int32')])
expr1 = t[t.e.sum().name('e'), t.f.sum().name('f')]
expr1

mysql compiles to

SELECT sum(t0.e) OVER (ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING) AS e, sum(t0.f) OVER (ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING) AS f 
FROM t5 AS t0

Expected behaviour

expr1 should aggregate instead of using window operation like the following expression

expr2 = t.aggregate([t.e.sum().name('e'), t.f.sum().name('f')])
expr2

mysql compiles to

SELECT sum(t0.e) AS e, sum(t0.f) AS f 
FROM t5 AS t0

[cpcloud]

@fuxinhao-crypto It looks like row_to_json isn’t a reduction. Can you try subclassing ValueOp instead?

[gforsyth]

@fuxinhao-crypto – would you mind re-posing this question over in https://github.com/ibis-project/ibis/discussions so it’s more easily discoverable for other users?