GreptimeTeam / greptimedb

An open-source, cloud-native, unified time series database for metrics, logs and events with SQL/PromQL supported. Available on GreptimeCloud.
https://greptime.com/
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fix: prepare param mismatch #5025

Closed CookiePieWw closed 14 hours ago

CookiePieWw commented 2 days ago

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Refer to a related PR or issue link (optional)

4970

What's changed and what's your intention?

Datafusion may convert the prepared sql to an optimized plan without initial params, so that we can't confirm if the param is needed when executing the prepared plan.

This patch introduces a workaroud that just drop the optimized plan if the param number mismatches and use the initial sql. It may affect the performance of the sql, but previously these sqls even cannot execute.

e.g.

PREPARE stmt FROM 'SELECT ? + 1 WHERE 1 = 0';
EXECUTE stmt USING 1;

Checklist

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waynexia commented 2 days ago

I'm curious about if this case will only generate a static plan without any input, or it will have other cases of mismatch. If not we can just drop the input and evaluate the static plan instead.

CookiePieWw commented 2 days ago

I'm curious about if this case will only generate a static plan without any input, or it will have other cases of mismatch. If not we can just drop the input and evaluate the static plan instead.

The case I came across just generate a static plan.

Initially I thought there're cases that part of the params are optimized and others are kept, thus we cannot match the params given by users to the optimized plan. But I'm not sure though, it's up to datafusion's optimization rules.

codecov[bot] commented 1 day ago

Codecov Report

Attention: Patch coverage is 60.00000% with 8 lines in your changes missing coverage. Please review.

Project coverage is 83.74%. Comparing base (3633f25) to head (fbcc37d). Report is 9 commits behind head on main.

Additional details and impacted files ```diff @@ Coverage Diff @@ ## main #5025 +/- ## ========================================== - Coverage 84.00% 83.74% -0.27% ========================================== Files 1149 1154 +5 Lines 214820 215570 +750 ========================================== + Hits 180450 180519 +69 - Misses 34370 35051 +681 ```

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