Fix chunk index error in auto_merge_chunks #3057
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hekaisheng
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mod: dataframe
to be backported
wjsi
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May 23, 2022
wjsi
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that referenced
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May 23, 2022
wjsi
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What do these changes do?
if a single chunk remains to merge in auto_merge_chunks, current code tries not to create a new concat OP and just use the last chunk. But the index of last chunk should be changed after merging.
This PR fixes this issue.
Related issue number
Fixes #3056
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