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Add option to create indexes in HDFStore if user is using PyTables Pro / PyTables 2.3+ #698

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wesm opened this issue Jan 26, 2012 · 3 comments
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Add option to create indexes in HDFStore if user is using PyTables Pro / PyTables 2.3+ #698

wesm opened this issue Jan 26, 2012 · 3 comments
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Enhancement
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0.10

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@wesm
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wesm commented Jan 26, 2012

Should just silently fail otherwise if the PyTables version in use does not have the indexing functionality. Should be fairly simple to add, only affects Table formatted objects
@jreback
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jreback commented Jan 27, 2012

requires pytables 2.3.1 at a minimum (the 'pro' version which is now open source)
currently a bug in the indexing routines in pytables that prevents an index on a Time64Col from working - see PyTables/PyTables#119

pandas should try to index the 'index' column in (and only) a table, probably by default
how to deal with a pytables version that is not supported?

@jreback
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jreback commented Nov 12, 2012

this is actually pretty easy since 0.8.1....as now the indicies are Int64 and thus indexing works great
I by default index the 'index' column in all of my panels, but this could be provided as an option....I will take a hack at this after 0.9.1 comes out....

will have to disable auto-indexing for any Time64Cols though....

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jreback commented Nov 15, 2012

pytables_docs closes this PR

@jreback jreback mentioned this issue Nov 15, 2012
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jreback added a commit to jreback/pandas that referenced this issue Nov 24, 2012
@jreback
changes to HDFStore:
94bd4e7 
      1. added __str__ (to do __repr__)
      2. added __delitem__ to support store deletion syntatic sugar
      3. row removal in tables is much faster if rows are consecutive
      4. added Term class, refactored Selection (this is backwards compatible)
         Term is a concise way of specifying conditions for queries, e.g.

            Term(dict(field = 'index', op = '>', value = '20121114'))
            Term('index', '20121114')
            Term('index', '>', '20121114')
            Term('index', ['20121114','20121114'])
            Term('index', datetime(2012,11,14))
            Term('index>20121114')

            added alias to the Term class; you can specify the nomial indexers (e.g. index in DataFrame, major_axis/minor_axis or alias in Panel)

	 this should close GH pandas-dev#1996

      5. added Col class to manage the column conversions
      6. added min_itemsize parameter and checks in pytables to allow setting of indexer columns minimum size
      7. added indexing support via method create_table_index (requires 2.3 in PyTables)
      	 btw now works quite well as Int64 indicies are used as opposed to the Time64Col which has a bug); includes a check on the pytables version requirement

	 this should close GH pandas-dev#698

      8. signficantlly updated docs for pytables to reflect all changes; added docs for Table sections
      9. BUG: a store would fail if appending but the a put had not been done before (see test_append)
         this the result of incompatibility testing on the index_kind
     10. BUG: minor change to select and remove: require a table ONLY if where is also provided (and not None)

      all tests pass; tests added for new features
@jreback jreback mentioned this issue Nov 24, 2012
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@jreback jreback mentioned this issue Dec 20, 2012
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@wesm wesm closed this as completed Dec 28, 2012
dan-nadler pushed a commit to dan-nadler/pandas that referenced this issue Sep 23, 2019
@shashank88
Merge pull request pandas-dev#698 from shashank88/basic_config
c7a53bf 
Fix no handler in logging warning
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