Fix segfilecount of AO/AOCO when bulk insertion: COPY #530
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Fix #529.
For COPY FROM on AO/AOCO tables, we need to try switch physical seg files on the fly during bulk insertion. Else, only one insertDesc will be used and the GUC around segfilecount does't take effect.
That's important for parallel plan.
For AO specially, bulk insertion is optimized to reuse var block if possible, leads to additional check.
Also fix memory leak for used_segment_files which is allocated at enter_dml_state() and shoule be preed when dml finished.
Authored-by: Zhang Mingli [email protected]
fix #ISSUE_Number
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