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Overview
| Comment: | Minor correct errors in the file format description for FTS3/4 contained in the fts3.c header comment. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | fts4-incr-merge |
| Files: | files | file ages | folders |
| SHA1: |
fb8aacdd8fbdc946cb271cc589f76b80 |
| User & Date: | drh 2012-03-27 00:38:33 |
Context
|
2012-03-27
| ||
| 13:44 | Merge the fts4-incr-merge-exp branch with fts4-incr-merge. check-in: eb00b958 user: dan tags: fts4-incr-merge | |
| 11:48 | Allow multiple incremental merges to proceed concurrently. This is required to prevent a large crisis-merge from occuring while an even larger incremental-merge is underway. Closed-Leaf check-in: 7ed9d2f2 user: dan tags: fts4-incr-merge-exp | |
| 00:38 | Minor correct errors in the file format description for FTS3/4 contained in the fts3.c header comment. check-in: fb8aacdd user: drh tags: fts4-incr-merge | |
| 00:34 | Enhance fts3view to show decodes of segments and doclists. check-in: 6d09de23 user: drh tags: fts4-incr-merge | |
Changes
Changes to ext/fts3/fts3.c.
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**
** FTS3 used to optionally store character offsets using a compile-time
** option. But that functionality is no longer supported.
**
** A doclist is stored like this:
**
** array {
** varint docid;
** array { (position list for column 0)
** varint position; (2 more than the delta from previous position)
** }
** array {
** varint POS_COLUMN; (marks start of position list for new column)
** varint column; (index of new column)
** array {
................................................................................
** value: 123 5 9 1 1 14 35 0 234 72 0
**
** The 123 value is the first docid. For column zero in this document
** there are two matches at positions 3 and 10 (5-2 and 9-2+3). The 1
** at D signals the start of a new column; the 1 at E indicates that the
** new column is column number 1. There are two positions at 12 and 45
** (14-2 and 35-2+12). The 0 at H indicate the end-of-document. The
** 234 at I is the next docid. It has one position 72 (72-2) and then
** terminates with the 0 at K.
**
** A "position-list" is the list of positions for multiple columns for
** a single docid. A "column-list" is the set of positions for a single
** column. Hence, a position-list consists of one or more column-lists,
** a document record consists of a docid followed by a position-list and
** a doclist consists of one or more document records.
**
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66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
..
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
**
** FTS3 used to optionally store character offsets using a compile-time
** option. But that functionality is no longer supported.
**
** A doclist is stored like this:
**
** array {
** varint docid; (delta from previous doclist)
** array { (position list for column 0)
** varint position; (2 more than the delta from previous position)
** }
** array {
** varint POS_COLUMN; (marks start of position list for new column)
** varint column; (index of new column)
** array {
................................................................................
** value: 123 5 9 1 1 14 35 0 234 72 0
**
** The 123 value is the first docid. For column zero in this document
** there are two matches at positions 3 and 10 (5-2 and 9-2+3). The 1
** at D signals the start of a new column; the 1 at E indicates that the
** new column is column number 1. There are two positions at 12 and 45
** (14-2 and 35-2+12). The 0 at H indicate the end-of-document. The
** 234 at I is the delta to next docid (357). It has one position 70
** (72-2) and then terminates with the 0 at K.
**
** A "position-list" is the list of positions for multiple columns for
** a single docid. A "column-list" is the set of positions for a single
** column. Hence, a position-list consists of one or more column-lists,
** a document record consists of a docid followed by a position-list and
** a doclist consists of one or more document records.
**
|