[SPARK-21300][SQL] ExternalMapToCatalyst should null-check map key prior to converting to internal value.#18524

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Commits on Jul 4, 2017

Modify ExternalMapToCatalyst to null-check map key prior to converting to internal value.
ueshin
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Commits on Jul 5, 2017

Modify ExternalMapToCatalyst to handle that the map key might be nullable.
ueshin
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