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## What changes were proposed in this pull request? The `[[` method is supposed to take a single index and return a column. This is different from base R which takes a vector index. We should check for this and issue warning or error when vector index is supplied (which is very likely given the behavior in base R). Currently I'm issuing a warning message and just take the first element of the vector index. We could change this to an error it that's better. ## How was this patch tested? new tests Author: actuaryzhang <actuaryzhang10@gmail.com> Closes #17017 from actuaryzhang/sparkRSubsetter. |
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