Created memory efficient iterator for importexport_importdata table#10918

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diwipl wants to merge 3 commits intomagento:2.3-developfrom diwipl:develop

+235-75

Commits on Sep 17, 2017

Created memory efficient iterator for importexport_importdata table
diwipl
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Splitted iterator into iterator and data provider. Resolved all comments from PR. Fixed unit tests
diwipl
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Commits on Sep 18, 2017

Changed table name to ->getMainTable()
diwipl
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