[Enhancement](ExternalTable)Optimize the performance of getCachedRowCount when reading ExternalTable #41659
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…ount when reading ExternalTable
hubgeter
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Proposed changes
Because ExternalTable will initialize the previously uninitialized table when
getCachedRowCount(), which is unnecessary. So for the uninitialized table, we directly return -2.This will increase the speed of our query
information_schema.tables.