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[Opt] (multi-catalog) opt max scanner thread number in batch split mo…
…de. (apache#44635) ### What problem does this PR solve? Problem Summary: There's only one scan range for each backend in batch split mode. Each backend only starts up one ScanNode instance. However, when calculating the concurrency of scanners in the scan operator in batch split mode, it is not divided by 1, but by `query_parallel_instance_num`, resulting in poor performance of batch split mode.
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