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    1: # 2011 March 3
    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: #
   12: # This file implements tests for SQLite library.  The focus of the tests
   13: # in this file a corner-case query planner optimization involving the
   14: # join order of two tables of different sizes.
   15: #
   16: 
   17: set testdir [file dirname $argv0]
   18: source $testdir/tester.tcl
   19: 
   20: ifcapable !stat3 {
   21:   finish_test
   22:   return
   23: }
   24: 
   25: set testprefix analyze6
   26: 
   27: proc eqp {sql {db db}} {
   28:   uplevel execsql [list "EXPLAIN QUERY PLAN $sql"] $db
   29: }
   30: 
   31: do_test analyze6-1.0 {
   32:   db eval {
   33:     CREATE TABLE cat(x INT);
   34:     CREATE UNIQUE INDEX catx ON cat(x);
   35:     /* Give cat 16 unique integers */
   36:     INSERT INTO cat VALUES(1);
   37:     INSERT INTO cat VALUES(2);
   38:     INSERT INTO cat SELECT x+2 FROM cat;
   39:     INSERT INTO cat SELECT x+4 FROM cat;
   40:     INSERT INTO cat SELECT x+8 FROM cat;
   41: 
   42:     CREATE TABLE ev(y INT);
   43:     CREATE INDEX evy ON ev(y);
   44:     /* ev will hold 32 copies of 16 integers found in cat */
   45:     INSERT INTO ev SELECT x FROM cat;
   46:     INSERT INTO ev SELECT x FROM cat;
   47:     INSERT INTO ev SELECT y FROM ev;
   48:     INSERT INTO ev SELECT y FROM ev;
   49:     INSERT INTO ev SELECT y FROM ev;
   50:     INSERT INTO ev SELECT y FROM ev;
   51:     ANALYZE;
   52:     SELECT count(*) FROM cat;
   53:     SELECT count(*) FROM ev;
   54:   }
   55: } {16 512}
   56: 
   57: # The lowest cost plan is to scan CAT and for each integer there, do a single
   58: # lookup of the first corresponding entry in EV then read off the equal values
   59: # in EV.  (Prior to the 2011-03-04 enhancement to where.c, this query would
   60: # have used EV for the outer loop instead of CAT - which was about 3x slower.)
   61: #
   62: do_test analyze6-1.1 {
   63:   eqp {SELECT count(*) FROM ev, cat WHERE x=y}
   64: } {0 0 1 {SCAN TABLE cat (~16 rows)} 0 1 0 {SEARCH TABLE ev USING COVERING INDEX evy (y=?) (~32 rows)}}
   65: 
   66: # The same plan is chosen regardless of the order of the tables in the
   67: # FROM clause.
   68: #
   69: do_test analyze6-1.2 {
   70:   eqp {SELECT count(*) FROM cat, ev WHERE x=y}
   71: } {0 0 0 {SCAN TABLE cat (~16 rows)} 0 1 1 {SEARCH TABLE ev USING COVERING INDEX evy (y=?) (~32 rows)}}
   72: 
   73: 
   74: # Ticket [83ea97620bd3101645138b7b0e71c12c5498fe3d] 2011-03-30
   75: # If ANALYZE is run on an empty table, make sure indices are used
   76: # on the table.
   77: #
   78: do_test analyze6-2.1 {
   79:   execsql {
   80:     CREATE TABLE t201(x INTEGER PRIMARY KEY, y UNIQUE, z);
   81:     CREATE INDEX t201z ON t201(z);
   82:     ANALYZE;
   83:   }
   84:   eqp {SELECT * FROM t201 WHERE z=5}
   85: } {0 0 0 {SEARCH TABLE t201 USING INDEX t201z (z=?) (~10 rows)}}
   86: do_test analyze6-2.2 {
   87:   eqp {SELECT * FROM t201 WHERE y=5}
   88: } {0 0 0 {SEARCH TABLE t201 USING INDEX sqlite_autoindex_t201_1 (y=?) (~1 rows)}}
   89: do_test analyze6-2.3 {
   90:   eqp {SELECT * FROM t201 WHERE x=5}
   91: } {0 0 0 {SEARCH TABLE t201 USING INTEGER PRIMARY KEY (rowid=?) (~1 rows)}}
   92: do_test analyze6-2.4 {
   93:   execsql {
   94:     INSERT INTO t201 VALUES(1,2,3);
   95:     ANALYZE t201;
   96:   }
   97:   eqp {SELECT * FROM t201 WHERE z=5}
   98: } {0 0 0 {SEARCH TABLE t201 USING INDEX t201z (z=?) (~10 rows)}}
   99: do_test analyze6-2.5 {
  100:   eqp {SELECT * FROM t201 WHERE y=5}
  101: } {0 0 0 {SEARCH TABLE t201 USING INDEX sqlite_autoindex_t201_1 (y=?) (~1 rows)}}
  102: do_test analyze6-2.6 {
  103:   eqp {SELECT * FROM t201 WHERE x=5}
  104: } {0 0 0 {SEARCH TABLE t201 USING INTEGER PRIMARY KEY (rowid=?) (~1 rows)}}
  105: do_test analyze6-2.7 {
  106:   execsql {
  107:     INSERT INTO t201 VALUES(4,5,7);
  108:     INSERT INTO t201 SELECT x+100, y+100, z+100 FROM t201;
  109:     INSERT INTO t201 SELECT x+200, y+200, z+200 FROM t201;
  110:     INSERT INTO t201 SELECT x+400, y+400, z+400 FROM t201;
  111:     ANALYZE t201;
  112:   }
  113:   eqp {SELECT * FROM t201 WHERE z=5}
  114: } {0 0 0 {SEARCH TABLE t201 USING INDEX t201z (z=?) (~10 rows)}}
  115: do_test analyze6-2.8 {
  116:   eqp {SELECT * FROM t201 WHERE y=5}
  117: } {0 0 0 {SEARCH TABLE t201 USING INDEX sqlite_autoindex_t201_1 (y=?) (~1 rows)}}
  118: do_test analyze6-2.9 {
  119:   eqp {SELECT * FROM t201 WHERE x=5}
  120: } {0 0 0 {SEARCH TABLE t201 USING INTEGER PRIMARY KEY (rowid=?) (~1 rows)}}
  121: 
  122: finish_test