sqlite/test/cursorhint.test

# 2014 July 15
#
# 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.
#
#***********************************************************************
# This file implements regression tests for SQLite library.
#

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

ifcapable !cursorhints {
  finish_test
  return
}

do_execsql_test 1.0 {
  CREATE TABLE t1(a,b,c,d);
  CREATE TABLE t2(x,y,z);
  INSERT INTO t1(a,b) VALUES(10, 15);
  INSERT INTO t1(a,b) VALUES(20, 25);
  INSERT INTO t2(x,y) VALUES('ten', 'fifteen');
  INSERT INTO t2(x,y) VALUES('twenty', 'twentyfive');
  CREATE TABLE t3(id TEXT PRIMARY KEY, a, b, c, d) WITHOUT ROWID;
  INSERT INTO t3(id,a,b,c,d) SELECT rowid, a, b, c, d FROM t1;
  PRAGMA automatic_index = 0;
}

# Run EXPLAIN on $sql.  Return a list of P4 values for all $opcode
# opcodes.
#
proc p4_of_opcode {db opcode sql} {
  set res {}
  $db eval "EXPLAIN $sql" x {
    if {$x(opcode)==$opcode} {lappend res $x(p4)}
  }
  return $res
}

# Run EXPLAIN on $sql.  Return a list of P5 values for all $opcode
# opcodes that contain regexp $comment in their comment
#
proc p5_of_opcode {db opcode sql} {
  set res {}
  $db eval "EXPLAIN $sql" x {
    if {$x(opcode)==$opcode} {
      lappend res $x(p5)
    }
  }
  return $res
}

# Verify that when t1 is in the outer loop and t2 is in the inner loop,
# no cursor hints occur for t1 (since it is a full table scan) but that
# each t2 access has a cursor hint based on the current t1.a value.
#
do_test 1.1 {
  p4_of_opcode db CursorHint {
     SELECT * FROM t1 CROSS JOIN t2 WHERE a=x
  }
} {{EQ(r[1],c0)}}
do_test 1.2 {
  p5_of_opcode db OpenRead {
     SELECT * FROM t1 CROSS JOIN t2 WHERE a=x
  }
} {00 00}

# Do the same test the other way around.
#
do_test 2.1 {
  p4_of_opcode db CursorHint {
     SELECT * FROM t2 CROSS JOIN t1 WHERE a=x
  }
} {{EQ(c0,r[1])}}
do_test 2.2 {
  p5_of_opcode db OpenRead {
     SELECT * FROM t2 CROSS JOIN t1 WHERE a=x
  }
} {00 00}

# Various expressions captured by CursorHint
#
do_test 3.1 {
  p4_of_opcode db CursorHint {
    SELECT * FROM t1 WHERE a=15 AND c=22 AND rowid!=98
  }
} {AND(AND(EQ(c0,15),EQ(c2,22)),NE(rowid,98))}
do_test 3.2 {
  p4_of_opcode db CursorHint {
    SELECT * FROM t3 WHERE a<15 AND b>22 AND id!=98
  }
} {AND(AND(LT(c1,15),GT(c2,22)),NE(c0,98))}

# Indexed queries
#
do_test 4.1asc {
  db eval {
    CREATE INDEX t1bc ON t1(b,c);
    CREATE INDEX t2yz ON t2(y,z);
  }
  p4_of_opcode db CursorHint {
    SELECT * FROM t1 WHERE b>11 ORDER BY b ASC;
  }
} {}
do_test 4.1desc {
  p4_of_opcode db CursorHint {
    SELECT * FROM t1 WHERE b>11 ORDER BY b DESC;
  }
} {GT(c0,11)}
do_test 4.2 {
  p5_of_opcode db OpenRead {
    SELECT * FROM t1 WHERE b>11;
  }
} {02 00}
do_test 4.3asc {
  p4_of_opcode db CursorHint {
    SELECT c FROM t1 WHERE b<11 ORDER BY b ASC;
  }
} {LT(c0,11)}
do_test 4.3desc {
  p4_of_opcode db CursorHint {
    SELECT c FROM t1 WHERE b<11 ORDER BY b DESC;
  }
} {}
do_test 4.4 {
  p5_of_opcode db OpenRead {
    SELECT c FROM t1 WHERE b<11;
  }
} {00}

do_test 4.5asc {
  p4_of_opcode db CursorHint {
    SELECT c FROM t1 WHERE b>=10 AND b<=20 ORDER BY b ASC;
  }
} {LE(c0,20)}
do_test 4.5desc {
  p4_of_opcode db CursorHint {
    SELECT c FROM t1 WHERE b>=10 AND b<=20 ORDER BY b DESC;
  }
} {GE(c0,10)}

# If there are any equality terms used in the constraint, then all terms
# should be hinted.
#
do_test 4.6asc {
  p4_of_opcode db CursorHint {
    SELECT rowid FROM t1 WHERE b=22 AND c>=10 AND c<=20 ORDER BY b,c ASC;
  }
} {AND(AND(EQ(c0,22),GE(c1,10)),LE(c1,20))}
do_test 4.6desc {
  p4_of_opcode db CursorHint {
    SELECT rowid FROM t1 WHERE b=22 AND c>=10 AND c<=20 ORDER BY b,c DESC;
  }
} {AND(AND(EQ(c0,22),GE(c1,10)),LE(c1,20))}

finish_test