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Refs: issue #9
I've investigated what is difference of this plugin and embulk-output-jdbc plugin.
Finally, I found the difference, this plugin is not check whether column value is null or not null.
So this pull request add
handling null value
feature like ColumnSetter of embulk-output-jdbc plugin.note
I tested this code with large log file (191705 lines) and loaded to my elasticsearch successfully.