Roman Kondakov created IGNITE-11756:
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Summary: SQL: implement a table row count statistics for the local
queries
Key: IGNITE-11756
URL: https://issues.apache.org/jira/browse/IGNITE-11756
Project: Ignite
Issue Type: Improvement
Components: sql
Reporter: Roman Kondakov
Row count statistics should help the H2 optimizer to select the better query
execution plan. Currently the row count supplied to H2 engine is hardcoded
value == 10000 (see {{org.h2.index.Index#getRowCountApproximation}}). As a
first step we can provide an actual table size in the case of local query. To
prevent counting size on each invocation we can cache row count value and
invalidate it in some cases:
* Rebalancing
* Multiple updates (after the initial loading)
* On timeout (i.e. 1 minute)
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