Aleksey Plekhanov created IGNITE-28892:
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Summary: Double view iteration for select from system views on H2
engine
Key: IGNITE-28892
URL: https://issues.apache.org/jira/browse/IGNITE-28892
Project: Ignite
Issue Type: Improvement
Reporter: Aleksey Plekhanov
Currently, for inner collection views to view size we must iterate over the
view. In H2 engine {{getRowCount()}} method returns {{sysView.size()}} and
iterates over the view in some cases (see
{{SystemViewH2Adapter.getRowCount()}}). H2 can call {{getRowCount()}} to
calculate query cost, it leads to double view iterations. We can override
{{canGetRowCount()}} method for some views to aviod this.
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