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added support for backslash escape in selector #5

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@illes illes commented Oct 9, 2016

There was no way to query by names containing special chars, e.g. {"a.b": 42}, which is now possible with the backslash-escaped selector $.a\.b

NOTE: the backslash itself is a special char for impala thus it needs to be escaped:

> SELECT json_get_object('{"a.b":42}', '$.a\\.b');
...
| 42
+----

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