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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2012-07-12 16:26:59 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2012-07-12 16:26:59 -0400 |
| commit | a36088bcfae85eeeb55e85c3f06c61cb2f0621c6 (patch) | |
| tree | 06c174014c3d8a37fe688a8ea1f65e75c629754c /src/backend/utils/adt/xml.c | |
| parent | 76720bdf1a817d999b9a8c3478a136793e5abec6 (diff) | |
| download | postgresql-a36088bcfae85eeeb55e85c3f06c61cb2f0621c6.tar.gz postgresql-a36088bcfae85eeeb55e85c3f06c61cb2f0621c6.zip | |
Skip text->binary conversion of unnecessary columns in contrib/file_fdw.
When reading from a text- or CSV-format file in file_fdw, the datatype
input routines can consume a significant fraction of the runtime.
Often, the query does not need all the columns, so we can get a useful
speed boost by skipping I/O conversion for unnecessary columns.
To support this, add a "convert_selectively" option to the core COPY code.
This is undocumented and not accessible from SQL (for now, anyway).
Etsuro Fujita, reviewed by KaiGai Kohei
Diffstat (limited to 'src/backend/utils/adt/xml.c')
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