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Remove sorting from query plan stream properties

Open KochetovNicolai opened this issue 1 year ago • 1 comments

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Because it is too complicated to support.

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KochetovNicolai avatar Aug 15 '24 13:08 KochetovNicolai

This is an automated comment for commit dfe8eb059c9d244317436c076d2a39781d345b61 with description of existing statuses. It's updated for the latest CI running

❌ Click here to open a full report in a separate page

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robot-clickhouse avatar Aug 15 '24 13:08 robot-clickhouse

This PR fixed push_down_limit performance test but broke optimize_sorting_for_input_stream.

novikd avatar Sep 30 '24 13:09 novikd

Ok, it is only with optimize_read_in_order=0, which is 1 by default. ~~Will fix it later.~~

UPD I have decided not to fix two failed tests. They are based on the assumption that reading from MergeTree returns chunks ordered by sorting key

Sorting (Chunk): CounterID ASC, EventDate ASC

I believe this assumption is not valid (or, at least, very fragile). We can easily have a situation when the reading task reads from 2 parts and forms a single chunk from it. We can enforce returning sorted chunks if needed. But why do we need it if we already have a read-in-order feature enabled by default?

KochetovNicolai avatar Sep 30 '24 14:09 KochetovNicolai