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Ticket UUID: 11d5aa455e0d98f3c1e6a084a89309710458ee4d
Title: sqlite3_trace() sometimes does not invoke its callback
Status: Fixed Type: Code_Defect
Severity: Minor Priority: Immediate
Subsystem: Unknown Resolution: Fixed
Last Modified: 2014-08-19 20:27:37
Version Found In: 3.8.6
User Comments:
drh added on 2014-08-19 19:57:38: (text/x-fossil-wiki)
The callback to sqlite3_trace() is suppose to be invoked for every SQL statement
that is run by the VDBE.  But sometimes the callback will be suppressed.  If
the prepared statement is marked as expired (which can happen, for example,
if the RHS of an expression like "x GLOB ?1" is rebound and X is an indexed
text column) then the callback is not invoked.  This can be seen in the shell
by running:

<blockquote><verbatim>
.trace stderr
.tables
</verbatim></blockquote>

The SELECT statement that implements the ".tables" command is not traced.

This problem appears to have existed since 2012-10-03, version 3.7.15 and
check-in [39f763bfc04174ee0fe2cdf6a92].  The problem was discovered during
internal testing and has not been observed in the wild.