Dan Suzuki 472ba14dfe Support Map type in ORC extension (#5363)
* Support map type in orc extension.
Added getMapObject in OrcHadoopInputRowParser
Updated parse tests to parse map-type field in OrcHadoopInputRowParserTest

* changed from for-loop to foreach

* added resolution of column names when map types are exploded to several
columns. updated the document as well -- orc.md.

* Update orc.md

change from review
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..
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