[fix](nereids) fix multi window projection issue temporarily #24912
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morrySnow
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Sep 26, 2023
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starocean999
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vinlee19
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Oct 7, 2023
…24912) Current multi-window plan generation has problem on the project sequence, for example: +--LogicalWindow ( windowExpressions=[avg(sum_sales#115) WindowSpec(...) AS `avg_monthly_sales`apache#116, rank() WindowSpec(...) AS `rn`apache#117], ...) and correspond physical plan is: +--PhysicalWindow[6572]@16 ( windowFrameGroup=(Funcs=[avg(sum_sales#115) WindowSpec(...) AS `avg_monthly_sales`apache#116], ... ) +--PhysicalWindow[6568]@29 ( windowFrameGroup=(Funcs=[rank() WindowSpec(...) AS `rn`apache#117], ...] ) If the final plan is generated as following: MultiCastDataSinks STREAM DATA SINK EXCHANGE ID: 20 HASH_PARTITIONED: rn[apache#208], i_brand[apache#202], cc_name[apache#203], i_category[apache#201] Before we eventually resolve the multi-window issue, we add a projection as following and force a mapping but this will not cover all potential problems. MultiCastDataSinks STREAM DATA SINK EXCHANGE ID: 20 HASH_PARTITIONED: rn[apache#219], i_brand[apache#213], cc_name[apache#214], i_category[apache#212] PROJECTIONS: i_category[apache#184], i_brand[apache#185], cc_name[apache#186], d_year[apache#187], d_moy[apache#188], sum_sales[apache#189], avg_monthly_sales[apache#191], rn[apache#190] PROJECTION TUPLE: 20
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Proposed changes
Current multi-window plan generation has problem on the project sequence, for example:
and correspond physical plan is:
If the final plan is generated as following:
Before we eventually resolve the multi-window issue, we add a projection as following and force a mapping but this will not cover all potential problems.
Further comments
If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...