column number 6 has no name

[GoogleCodeExporter]

敲入命令：
D:\wamp\www\sphinx\bin>indexer.exe --all

显示：
using config file './sphinx.conf'...
indexing index 'idx_venues'...
ERROR: index 'idx_venues': column number 6 has no name.
total 0 docs, 0 bytes
total 0.090 sec, 0 bytes/sec, 0.00 docs/sec
total 0 reads, 0.000 sec, 0.0 kb/call avg, 0.0 msec/call avg
total 0 writes, 0.000 sec, 0.0 kb/call avg, 0.0 msec/call avg

错误如下：
ERROR: index 'idx_venues': column number 6 has no name.

请问index里column number 是什么概念？

Original issue reported on code.google.com by [email protected] on 9 Jun 2010 at 4:20