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Ask questionsBetter memory observation for tidb_query executors

Feature Request

Inspired from https://github.com/pingcap/tidb/issues/11840. Currently we have no existing way to check how much memory is used in some memory-heavy executors like hash aggregation and top n. Adding metrics to these executors should help diagnose these kind of problems without the need to build a specialized binary.

tikv/tikv

Answer questions breeswish

@AlyHKafoury Thanks for your interest. Do you need any help or guidance?

useful!

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