support some data filter and more ETL functions when we use data load

[handsonbao]

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When i use load data, i can just split the files into several parts.
For example, i have a file named f1. I need to load it into a "Tag" named account and two "Edge type" named debit and loan.
The first column is source account id, the second column is target account id, the third column is edge type, the fourth column is amount.
I need to load the f1 into the edge type debit and loan by the value of the third column.

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support some data filter and more ETL functions when we use data load

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manually by other tools, such as mysql, shell or python.

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