[Pspp-commits] [SCM] GNU PSPP branch, master, updated. v0.7.9-893-gd0f2ab9

[Ben Pfaff]

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- Log -----------------------------------------------------------------
commit d0f2ab98f2b05a4641cb0d1d042fbe2ad89444aa
Author: Ben Pfaff <address@hidden>
Date:   Mon Jun 24 23:07:12 2013 -0700

    datasheet: Avoid reading a given row more than necessary in source_read().
    
    The datasheet casereader uses datasheet_get_row(), which calls rw_case(),
    which until this commit called source_read() for every column.  The latter
    was expensive if casereader_peek() actually copied data for a whole large
    row.  For a datasheet with N columns, all from a single backing source,
    the upshot was that datasheet_get_row() took O(N**2) time.
    
    This commit fixes the problem in the common case by reading as many columns
    as possible from a given source in a single call to source_read().
    
    Bug #33260.

-----------------------------------------------------------------------

Summary of changes:
 src/data/datasheet.c |  108 +++++++++++++++++++++++++++++++-------------------
 1 files changed, 67 insertions(+), 41 deletions(-)


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