Github user feynmanliang commented on the pull request:
https://github.com/apache/spark/pull/7854#issuecomment-134449433
It looks like the Python constructors enforce sorted indices (consistent
with Scala) only with numeric (and not String) args. This should be made
consistent, but it's not clear whether we should guarantee ordering at the cost
of sorting overhead or relax this constraint at the risk of breaking code
elsewhere.
We should clarify and clearly document if there is any guarantee on the
ordering of indices, since features like #7794 depend on this ordering.
CC @mengxr @jkbradley
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