google bigquery - Same exactly Query Fails or "Succeeds" with different Aliases used -

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below 2 versions of same query

version 1 (uses k alias in inner select):

select k [year], w_vol,    row_number() on (order k desc) rank1,   row_number() on (order w_vol desc) rank2 (   select w_vol, c_date k      (select 1590 c_date, 1 w_vol),     (select 1599 c_date, 1 w_vol),     (select 1602 c_date, 1 w_vol),     (select 1609 c_date, 2 w_vol),     (select 1610 c_date, 1 w_vol), ) order 1

version 2 (uses l alias in inner select):

select l [year], w_vol,    row_number() on (order l desc) rank1,   row_number() on (order w_vol desc) rank2 (   select w_vol, c_date l      (select 1590 c_date, 1 w_vol),     (select 1599 c_date, 1 w_vol),     (select 1602 c_date, 1 w_vol),     (select 1609 c_date, 2 w_vol),     (select 1610 c_date, 1 w_vol), ) order 1

below output consistently getting both queries (note no cached results used)

enter image description here

i expected result same no matter alias used - alias @ all!

question: why consistently getting failure version 1 , "success" version 2?

this rather interesting bug, news fixed in bigquery's standard sql. details how try out - check https://cloud.google.com/bigquery/sql-reference/enabling-standard-sql


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