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Overview
| Comment: | Add missing parenthesis to an expression in fts3.html. |
|---|---|
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
d366268bab815a5575855d708c55da81 |
| User & Date: | dan 2015-09-02 11:30:35 |
Context
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2015-09-07
| ||
| 10:53 | Fix two typos. check-in: 0506240273 user: drh tags: trunk | |
|
2015-09-02
| ||
| 11:30 | Add missing parenthesis to an expression in fts3.html. check-in: d366268bab user: dan tags: trunk | |
|
2015-08-28
| ||
| 18:13 | Improved explanation of how to build the command-line shell on the howtocompile.html page. check-in: 501ee3f88e user: drh tags: trunk | |
Changes
Changes to pages/fts3.in.
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<pre>
hits_for_phrase_p_column_c = array[c + p*cols]
</pre>
For queries that use OR expressions, or those that use LIMIT or return
many rows, the 'y' matchinfo option may be faster than 'x'.
<tr><td>b<td style="white-space:nowrap"><i>(cols+31)/32</i> * <i>phrases</i>
<td><tcl>hd_fragment matchinfo-b {matchinfo b flag}</tcl>
The matchinfo 'b' flag provides similar information to the
[matchinfo 'y' flag], but in a more
compact form. Instead of the precise number of hits, 'b' provides a single
boolean flag for each phrase/column combination. If the phrase is present in
the column at least once (i.e. if the corresponding integer output of 'y' would
................................................................................
contains data for phrase 0 and columns 32-44, and so on.
<p style="margin-left:0;margin-right:0">
For example, if nCol is the number of columns in the table, to determine if
phrase p is present in column c:
<pre>
p_is_in_c = array[p * (nCol+31)/32] & (1 << (c % 32))
</pre>
<tr><td>n <td>1 <td>The number of rows in the FTS4 table. This value is
only available when querying FTS4 tables, not FTS3.
<tr><td>a <td><i>cols</i> <td>For each column, the average number of
tokens in the text values stored in the column (considering all rows in
the FTS4 table). This value is only available when querying FTS4 tables,
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1165
1166
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1175
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1178
1179
....
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
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|
<pre>
hits_for_phrase_p_column_c = array[c + p*cols]
</pre>
For queries that use OR expressions, or those that use LIMIT or return
many rows, the 'y' matchinfo option may be faster than 'x'.
<tr><td>b<td style="white-space:nowrap"><i>((cols+31)/32)</i> * <i>phrases</i>
<td><tcl>hd_fragment matchinfo-b {matchinfo b flag}</tcl>
The matchinfo 'b' flag provides similar information to the
[matchinfo 'y' flag], but in a more
compact form. Instead of the precise number of hits, 'b' provides a single
boolean flag for each phrase/column combination. If the phrase is present in
the column at least once (i.e. if the corresponding integer output of 'y' would
................................................................................
contains data for phrase 0 and columns 32-44, and so on.
<p style="margin-left:0;margin-right:0">
For example, if nCol is the number of columns in the table, to determine if
phrase p is present in column c:
<pre>
p_is_in_c = array[p * ((nCol+31)/32)] & (1 << (c % 32))
</pre>
<tr><td>n <td>1 <td>The number of rows in the FTS4 table. This value is
only available when querying FTS4 tables, not FTS3.
<tr><td>a <td><i>cols</i> <td>For each column, the average number of
tokens in the text values stored in the column (considering all rows in
the FTS4 table). This value is only available when querying FTS4 tables,
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