Improve finding entity and field nodes#12

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kungwangtotvs wants to merge 2 commits intotwilmes:masterfrom

totvslabs:improve_finding_entity_and_field_nodes

Commits on Mar 13, 2017

improve finding nodes for entities and fields during join
kungwangtotvs
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fix java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Number
kungwangtotvs
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