SQLite

    FUNCTION(coalesce,           1, 0, 0, 0                ),
    FUNCTION(coalesce,           0, 0, 0, 0                ),
    FUNCTION2(coalesce,         -1, 0, 0, noopFunc,  SQLITE_FUNC_COALESCE),
    FUNCTION(hex,                1, 0, 0, hexFunc          ),
    FUNCTION2(ifnull,            2, 0, 0, noopFunc,  SQLITE_FUNC_COALESCE),
    FUNCTION2(unlikely,          1, 0, 0, noopFunc,  SQLITE_FUNC_UNLIKELY),
    FUNCTION2(likelihood,        2, 0, 0, noopFunc,  SQLITE_FUNC_UNLIKELY),
    FUNCTION2(likely,            1, 0, 0, noopFunc,  SQLITE_FUNC_UNLIKELY),
    VFUNCTION(random,            0, 0, 0, randomFunc       ),
    VFUNCTION(randomblob,        1, 0, 0, randomBlob       ),
    FUNCTION(nullif,             2, 0, 1, nullifFunc       ),
    FUNCTION(sqlite_version,     0, 0, 0, versionFunc      ),
    FUNCTION(sqlite_source_id,   0, 0, 0, sourceidFunc     ),
    FUNCTION(sqlite_log,         2, 0, 0, errlogFunc       ),
#ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS

              pNC->nErr++;
            }
          }else{
            /* EVIDENCE-OF: R-61304-29449 The unlikely(X) function is equivalent to
            ** likelihood(X, 0.0625).
            ** EVIDENCE-OF: R-01283-11636 The unlikely(X) function is short-hand for
            ** likelihood(X,0.0625). */
            /* TUNING: unlikely() probability is 0.0625.  likely() is 0.9375 */
            pExpr->iTable = pDef->zName[0]=='u' ? 62 : 938;
          }             
        }
      }
#ifndef SQLITE_OMIT_AUTHORIZATION
      if( pDef ){
        auth = sqlite3AuthCheck(pParse, SQLITE_FUNCTION, 0, pDef->zName, 0);
        if( auth!=SQLITE_OK ){

  SELECT quote(unlikely(x'010203000405'));
} {X'010203000405'}

# EVIDENCE-OF: R-22887-63324 The unlikely(X) function is a no-op that
# the code generator optimizes away so that it consumes no CPU cycles at
# run-time (that is, during calls to sqlite3_step()).
#
do_test func3-5.39 {
  db eval {EXPLAIN SELECT unlikely(min(1.0+'2.0',4*11))}
} [db eval {EXPLAIN SELECT min(1.0+'2.0',4*11)}]

do_execsql_test func3-5.40 {
  SELECT likely(9223372036854775807);
} {9223372036854775807}
do_execsql_test func3-5.41 {
  SELECT likely(-9223372036854775808);
} {-9223372036854775808}
do_execsql_test func3-5.42 {
  SELECT likely(14.125);
} {14.125}
do_execsql_test func3-5.43 {
  SELECT likely(NULL);
} {{}}
do_execsql_test func3-5.44 {
  SELECT likely('test-string');
} {test-string}
do_execsql_test func3-5.45 {
  SELECT quote(likely(x'010203000405'));
} {X'010203000405'}
do_test func3-5.49 {
  db eval {EXPLAIN SELECT likely(min(1.0+'2.0',4*11))}
} [db eval {EXPLAIN SELECT min(1.0+'2.0',4*11)}]



finish_test

# 2013-09-05
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# 
# Test cases for query planning decisions and the likely(), unlikely(), and
# likelihood() functions.

set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix whereG

do_execsql_test whereG-1.0 {

}
do_eqp_test 5.1.2 {
  SELECT * FROM t1 WHERE a>?
} {0 0 0 {SEARCH TABLE t1 USING INDEX i1 (a>?)}}
do_eqp_test 5.1.3 {
  SELECT * FROM t1 WHERE likelihood(a>?, 0.9)
} {0 0 0 {SCAN TABLE t1}}
do_eqp_test 5.1.4 {
  SELECT * FROM t1 WHERE likely(a>?)
} {0 0 0 {SCAN TABLE t1}}

do_test 5.2 {
  for {set i 0} {$i < 100} {incr i} {
    execsql { INSERT INTO t1 VALUES('abc', $i, $i); }
  }
  execsql { INSERT INTO t1 SELECT 'def', b, c FROM t1; }
  execsql { ANALYZE }
} {}
do_eqp_test 5.2.2 {
  SELECT * FROM t1 WHERE likelihood(b>?, 0.01)
} {0 0 0 {SEARCH TABLE t1 USING INDEX i1 (ANY(a) AND b>?)}}
do_eqp_test 5.2.3 {
  SELECT * FROM t1 WHERE likelihood(b>?, 0.9)
} {0 0 0 {SCAN TABLE t1}}
do_eqp_test 5.2.4 {
  SELECT * FROM t1 WHERE likely(b>?)
} {0 0 0 {SCAN TABLE t1}}

do_eqp_test 5.3.1 {
  SELECT * FROM t1 WHERE a=?
} {0 0 0 {SEARCH TABLE t1 USING INDEX i1 (a=?)}}
do_eqp_test 5.3.2 {
  SELECT * FROM t1 WHERE likelihood(a=?, 0.9)
} {0 0 0 {SCAN TABLE t1}}
do_eqp_test 5.3.3 {
  SELECT * FROM t1 WHERE likely(a=?)
} {0 0 0 {SCAN TABLE t1}}

finish_test