Add Index.to_frame.

[ueshin]

No description provided.

[ueshin]

Filed #1190.

[codecov-io]

Codecov Report

Merging #1187 into master will decrease coverage by 0.02%.
The diff coverage is 93.54%.

@@            Coverage Diff             @@
##           master    #1187      +/-   ##
==========================================
- Coverage   95.24%   95.21%   -0.03%     
==========================================
  Files          35       35              
  Lines        7105     7132      +27     
==========================================
+ Hits         6767     6791      +24     
- Misses        338      341       +3

Impacted Files	Coverage Δ
databricks/koalas/missing/indexes.py	100% <ø> (ø)	⬆️
databricks/koalas/indexes.py	96.3% <93.54%> (-0.59%)	⬇️
databricks/koalas/internal.py	95.72% <0%> (-0.02%)	⬇️
databricks/koalas/series.py	96.46% <0%> (ø)	⬆️

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[softagram-bot]

Softagram Impact Report for pull/1187 (head commit: 90b2aad)

⚠️ Copy paste found

ℹ️ test_indexes.py: Copy paste fragment on line 32 shared with ../test_numpy_compat.py:

    def pdf(self):
        return pd.DataFrame({
            'a': [1, 2, 3, 4, 5, 6, 7, 8, 9],
            'b': [4, 5, 6, 3, 2, 1, 0, 0, 0],
        }, index=[0, 1, 3, 5, 6, 8, 9, 9, 9])...(truncated 101 chars)

ℹ️ indexes.py: Copy paste fragment inside the same file on lines 858, 1578:

            raise NotImplementedError(
                \"Doesn't support symmetric_difference between Index & MultiIndex for now\")

        sdf_self = self._kdf._s...(truncated 477 chars)

Now that you are on the file, it would be easier to pay back some tech. debt.

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• Permalink: Full report for pull/1187

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[itholic]

I'm not pretty sure,

but how about index_map = [(SPARK_INDEX_NAME_FORMAT(0), None)]??

then maybe can we avoid attach_default_index ?

[ueshin]

What's the SPARK_INDEX_NAME_FORMAT(0) like here then?

[itholic]

ah, i was mistaken. sorry for the confusion. 😞

(i thought sdf already has index column, so we could rename it to __index_level_0__ using alias and make index_map as [('index_level_0', None)] explicitly, but it was my mistaken)