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sqlite3

    1: # 2011 October 13
    2: #
    3: # The author disclaims copyright to this source code.  In place of
    4: # a legal notice, here is a blessing:
    5: #
    6: #    May you do good and not evil.
    7: #    May you find forgiveness for yourself and forgive others.
    8: #    May you share freely, never taking more than you give.
    9: #
   10: #***********************************************************************
   11: # This file implements regression tests for SQLite library. Specifically,
   12: # it tests that ticket [fa7bf5ec94801e7e2030e41eefe5d9dd96eaacfd] has
   13: # been resolved.
   14: #
   15: # The problem described by this ticket was that the sqlite3ExprCompare()
   16: # function was saying that expressions (x='a') and (x='A') were identical
   17: # because it was using sqlite3StrICmp() instead of strcmp() to compare string
   18: # literals.  That was causing the query optimizer for aggregate queries to 
   19: # believe that both count() operations were identical, and thus only 
   20: # computing the first count() and making a copy of the result for the 
   21: # second count().
   22: #
   23: 
   24: set testdir [file dirname $argv0]
   25: source $testdir/tester.tcl
   26: 
   27: do_test tkt-fa7bf5ec-1 {
   28:   execsql {
   29:     CREATE TABLE t1(x);
   30:     INSERT INTO t1 VALUES ('a');
   31:     INSERT INTO t1 VALUES ('A');
   32:     INSERT INTO t1 VALUES ('A');
   33:     SELECT count(CASE WHEN x='a' THEN 1 END),
   34:            count(CASE WHEN x='A' THEN 1 END)
   35:       FROM t1;
   36:   }
   37: } {1 2}
   38: 
   39: finish_test