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PS-10232 [8.0]: Fix performance regression by limiting rows_in_buffer to query LIMIT #5775

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PS-10232 [8.0]: Fix performance regression by limiting rows_in_buffer to query LIMIT #5775

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3 changes: 3 additions & 0 deletions sql/sql_executor.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -741,6 +741,9 @@ bool set_record_buffer(TABLE *table, double expected_rows_to_fetch) {
}
}

// Do not allocate space for more rows than the handler asked for.
rows_in_buffer = std::min(rows_in_buffer, max_rows);

// After adjustments made above, we still need a minimum of 2 rows to
// use a record buffer.
if (rows_in_buffer <= 1) {
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