Implementing chunkSize in writesql #106
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Implemented chunkSize feature -
writesql has an additional parameter, chunkSize to determine the number of folds desired by user.
chunkSize is a number of folds to split dataframe and process incrementally by split.
The method currently only checks whether chunkSize is <= 0 or >= df.length(). Further checks on incorrect inputs such as string would be needed.
Closes #94