96 lines
2.3 KiB
Plaintext
96 lines
2.3 KiB
Plaintext
# 2014-04-26
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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#
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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set testprefix cost
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do_execsql_test 1.1 {
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CREATE TABLE t3(id INTEGER PRIMARY KEY, b NOT NULL);
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CREATE TABLE t4(c, d, e);
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CREATE UNIQUE INDEX i3 ON t3(b);
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CREATE UNIQUE INDEX i4 ON t4(c, d);
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}
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do_eqp_test 1.2 {
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SELECT e FROM t3, t4 WHERE b=c ORDER BY b, d;
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} {
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0 0 0 {SCAN TABLE t3 USING COVERING INDEX i3}
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0 1 1 {SEARCH TABLE t4 USING INDEX i4 (c=?)}
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}
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do_execsql_test 2.1 {
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CREATE TABLE t1(a, b);
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CREATE INDEX i1 ON t1(a);
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}
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# It is better to use an index for ORDER BY than sort externally, even
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# if the index is a non-covering index.
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do_eqp_test 2.2 {
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SELECT * FROM t1 ORDER BY a;
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} {
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0 0 0 {SCAN TABLE t1 USING INDEX i1}
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}
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do_execsql_test 3.1 {
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CREATE TABLE t5(a INTEGER PRIMARY KEY,b,c,d,e,f,g);
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CREATE INDEX t5b ON t5(b);
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CREATE INDEX t5c ON t5(c);
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CREATE INDEX t5d ON t5(d);
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CREATE INDEX t5e ON t5(e);
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CREATE INDEX t5f ON t5(f);
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CREATE INDEX t5g ON t5(g);
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}
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do_eqp_test 3.2 {
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SELECT a FROM t5
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WHERE b IS NULL OR c IS NULL OR d IS NULL
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ORDER BY a;
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} {
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0 0 0 {SEARCH TABLE t5 USING INDEX t5b (b=?)}
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0 0 0 {SEARCH TABLE t5 USING INDEX t5c (c=?)}
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0 0 0 {SEARCH TABLE t5 USING INDEX t5d (d=?)}
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0 0 0 {USE TEMP B-TREE FOR ORDER BY}
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}
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#-------------------------------------------------------------------------
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# If there is no likelihood() or stat3 data, SQLite assumes that a closed
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# range scan (e.g. one constrained by "col BETWEEN ? AND ?" constraint)
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# visits 1/16 of the rows in a table.
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#
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# Note: 1/17 =~ 0.058
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# Note: 1/15 =~ 0.067
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#
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reset_db
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do_execsql_test 4.1 {
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CREATE TABLE t1(a, b);
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CREATE INDEX i1 ON t1(a);
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CREATE INDEX i2 ON t1(b);
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}
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do_eqp_test 4.2 {
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SELECT * FROM t1 WHERE likelihood(a=?, 0.058) AND b BETWEEN ? AND ?;
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} {
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0 0 0 {SEARCH TABLE t1 USING INDEX i1 (a=?)}
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}
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do_eqp_test 4.3 {
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SELECT * FROM t1 WHERE likelihood(a=?, 0.067) AND b BETWEEN ? AND ?;
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} {
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0 0 0 {SEARCH TABLE t1 USING INDEX i2 (b>? AND b<?)}
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}
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finish_test
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