parquet-cat json dump is broken for maps

[asfimport]

When dumping parquet maps as json with the parquet-cat tool it throws class cast exception.

parquet-cat --debug --json file:///tmp/test.parquet

java.lang.ClassCastException: [B cannot be cast to java.lang.String
	at org.apache.parquet.tools.read.SimpleMapRecord.toJsonObject(SimpleMapRecord.java:34)
	at org.apache.parquet.tools.read.SimpleRecord.toJsonValue(SimpleRecord.java:119)
	at org.apache.parquet.tools.read.SimpleRecord.toJsonObject(SimpleRecord.java:112)
	at org.apache.parquet.tools.read.SimpleRecord.prettyPrintJson(SimpleRecord.java:106)
	at org.apache.parquet.tools.command.CatCommand.execute(CatCommand.java:76)
	at org.apache.parquet.tools.Main.main(Main.java:222)
[B cannot be cast to java.lang.String

Reporter: Nezih Yigitbasi / @nezihyigitbasi
Assignee: Nezih Yigitbasi / @nezihyigitbasi

PRs and other links:

• PR-259

_{Note: This issue was originally created as PARQUET-360. Please see the migration documentation for further details.}

[asfimport]

Ryan Blue / @rdblue:
Merged #360. Thanks @nezihyigitbasi!