SQLite

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains C code routines that are called by the parser
** to handle INSERT statements in SQLite.
**
** $Id: insert.c,v 1.176 2007/02/24 15:18:50 drh Exp $
*/
#include "sqliteInt.h"

/*
** Set P3 of the most recently inserted opcode to a column affinity
** string for index pIdx. A column affinity string has one character
** for each column in the table, according to the affinity of the column:

    for(pSrcIdx=pSrc->pIndex; pSrcIdx; pSrcIdx=pSrcIdx->pNext){
      if( xferCompatibleIndex(pDestIdx, pSrcIdx) ) break;
    }
    if( pSrcIdx==0 ){
      return 0;    /* pDestIdx has no corresponding index in pSrc */
    }
  }
  if( pDest->pCheck && !sqlite3ExprCompare(pSrc->pCheck, pDest->pCheck) ){
    return 0;   /* Tables have different CHECK constraints.  Ticket #2252 */
  }

  /* If we get this far, it means either:
  **
  **    *   We can always do the transfer if the table contains an
  **        an integer primary key

# 2007 January 24
#
# 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.  The
# focus of this file is testing the INSERT transfer optimization.
#
# $Id: insert4.test,v 1.3 2007/02/24 15:18:50 drh Exp $

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

# The sqlite3_xferopt_count variable is incremented whenever the 
# insert transfer optimization applies.
#
# This procedure runs a test to see if the sqlite3_xferopt_count is
# set to N.
#
proc xferopt_test {testname N} {
  do_test $testname {set ::sqlite3_xferopt_count} $N
}

# Create tables used for testing.
#
execsql {
  CREATE TABLE t1(a int, b int, check(b>a));
  CREATE TABLE t2(x int, y int);
  CREATE VIEW v2 AS SELECT y, x FROM t2;
  CREATE TABLE t3(a int, b int);
}

# Ticket #2252.  Make sure the an INSERT from identical tables
# does not violate constraints.
#
do_test insert4-1.1 {
  set sqlite3_xferopt_count 0
  execsql {
    DELETE FROM t1;
    DELETE FROM t2;
    INSERT INTO t2 VALUES(9,1);
  }
  catchsql {
    INSERT INTO t1 SELECT * FROM t2;
  }
} {1 {constraint failed}}
xferopt_test insert4-1.2 0
do_test insert4-1.3 {
  execsql {
    SELECT * FROM t1;
  }
} {}

# Tests to make sure that the transfer optimization is not occurring
# when it is not a valid optimization.
#
# The SELECT must be against a real table.
do_test insert4-2.1.1 {
  execsql {
    DELETE FROM t1;
    INSERT INTO t1 SELECT 4, 8;
    SELECT * FROM t1;
  }
} {4 8}
xferopt_test insert4-2.1.2  0
do_test insert4-2.2.1 {
  catchsql {
    DELETE FROM t1;

    INSERT INTO t1 SELECT * FROM v2;
    SELECT * FROM t1;
  }
} {0 {1 9}}
xferopt_test insert4-2.2.2 0

# Do not run the transfer optimization if there is a LIMIT clause
#
do_test insert4-2.3.1 {
  execsql {
    DELETE FROM t2;
    INSERT INTO t2 VALUES(9,1);
    INSERT INTO t2 SELECT y, x FROM t2;
    INSERT INTO t3 SELECT * FROM t2 LIMIT 1;
    SELECT * FROM t3;
  }
} {9 1}
xferopt_test insert4-2.3.2  0
do_test insert4-2.3.3 {

do_test insert4-2.4.3 {
  catchsql {
    DELETE FROM t1;
    INSERT INTO t1 SELECT DISTINCT * FROM t2;
  }
} {1 {constraint failed}}
xferopt_test insert4-2.4.4 0

# The following procedure constructs two tables then tries to transfer
# data from one table to the other.  Checks are made to make sure the
# transfer is successful and that the transfer optimization was used or
# not, as appropriate.
#
#     xfer_check TESTID  XFER-USED   INIT-DATA   DEST-SCHEMA   SRC-SCHEMA 
#
# The TESTID argument is the symbolic name for this test.  The XFER-USED
# argument is true if the transfer optimization should be employed and
# false if not.  INIT-DATA is a single row of data that is to be 
# transfered.  DEST-SCHEMA and SRC-SCHEMA are table declarations for
# the destination and source tables.
#
proc xfer_check {testid xferused initdata destschema srcschema} {
  execsql "CREATE TABLE dest($destschema)"
  execsql "CREATE TABLE src($srcschema)"
  execsql "INSERT INTO src VALUES([join $initdata ,])"
  set ::sqlite3_xferopt_count 0
  do_test $testid.1 {
    execsql {
      INSERT INTO dest SELECT * FROM src;
      SELECT * FROM dest;
    }
  } $initdata
  do_test $testid.2 {
    set ::sqlite3_xferopt_count
  } $xferused
  execsql {
    DROP TABLE dest;
    DROP TABLE src;
  }
}


# Do run the transfer optimization if tables have identical
# CHECK constraints.
#
xfer_check insert4-3.1 1 {1 9} \
    {a int, b int CHECK(b>a)} \
    {x int, y int CHECK(y>x)}
xfer_check insert4-3.2 1 {1 9} \
    {a int, b int CHECK(b>a)} \
    {x int CHECK(y>x), y int}

# Do run the transfer optimization if the destination table lacks
# any CHECK constraints regardless of whether or not there are CHECK
# constraints on the source table.
#
xfer_check insert4-3.3 1 {1 9} \
    {a int, b int} \
    {x int, y int CHECK(y>x)}

# Do run the transfer optimization if the destination table omits
# NOT NULL constraints that the source table has.
#
xfer_check insert4-3.4 0 {1 9} \
    {a int, b int CHECK(b>a)} \
    {x int, y int}

# Do not run the optimization if the destination has NOT NULL
# constraints that the source table lacks.
#
xfer_check insert4-3.5 0 {1 9} \
    {a int, b int NOT NULL} \
    {x int, y int}
xfer_check insert4-3.6 0 {1 9} \
    {a int, b int NOT NULL} \
    {x int NOT NULL, y int}
xfer_check insert4-3.7 0 {1 9} \
    {a int NOT NULL, b int NOT NULL} \
    {x int NOT NULL, y int}
xfer_check insert4-3.8 0 {1 9} \
    {a int NOT NULL, b int} \
    {x int, y int}


# Do run the transfer optimization if the destination table and
# source table have the same NOT NULL constraints or if the 
# source table has extra NOT NULL constraints.
#
xfer_check insert4-3.9 1 {1 9} \
    {a int, b int} \
    {x int NOT NULL, y int}
xfer_check insert4-3.10 1 {1 9} \
    {a int, b int} \
    {x int NOT NULL, y int NOT NULL}
xfer_check insert4-3.11 1 {1 9} \
    {a int NOT NULL, b int} \
    {x int NOT NULL, y int NOT NULL}
xfer_check insert4-3.12 1 {1 9} \
    {a int, b int NOT NULL} \
    {x int NOT NULL, y int NOT NULL}

# Do not run the optimization if any corresponding table
# columns have different affinities.
#
xfer_check insert4-3.20 0 {1 9} \
    {a text, b int} \
    {x int, b int}
xfer_check insert4-3.21 0 {1 9} \
    {a int, b int} \
    {x text, b int}

# "int" and "integer" are equivalent so the optimization should
# run here.
#
xfer_check insert4-3.22 1 {1 9} \
    {a int, b int} \
    {x integer, b int}


finish_test

# 2007 Febuary 24
#
# 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.
#
# This file implements tests to verify that table column values
# are pulled out of the database correctly.
#
# Long ago, the OP_Column opcode was sufficient to pull out the
# value of a table column.  But then we added the ALTER TABLE ADD COLUMN
# feature.  An added column might not actually exist in every row,
# and so the OP_Column opcode has to contain a default value.  Later
# still we added a feature whereby a REAL value with no fractional
# part is stored in the database file as an integer to save space.
# After extracting the value, we have to call OP_RealAffinity to
# convert it back to a REAL.
#
# The sqlite3ExprCodeGetColumn() routine was added to take care of
# all of the complications above.  The tests in this file attempt
# to verify that sqlite3ExprCodeGetColumn() is used instead of a
# raw OP_Column in all places where a table column is extracted from
# the database.
#
# $Id: tkt2251.test,v 1.1 2007/02/24 15:18:51 drh Exp $

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

# Create sample data.  Verify that the default value and type of an added
# column is correct for aggregates.
do_test tkt2251-1.1 {
  execsql {
    CREATE TABLE t1(a INTEGER);
    INSERT INTO t1 VALUES(1);
    INSERT INTO t1 VALUES(1);
    INSERT INTO t1 VALUES(2);
    INSERT INTO t1 VALUES(9);
    INSERT INTO t1 VALUES(9);
    INSERT INTO t1 VALUES(9);
    INSERT INTO t1 VALUES(3);
    INSERT INTO t1 VALUES(2);
    ALTER TABLE t1 ADD COLUMN b REAL DEFAULT 4.0;
    SELECT avg(b), typeof(avg(b)) FROM t1;
  }
} {4.0 real}
do_test tkt2251-1.2 {
  execsql {
    SELECT sum(b), typeof(sum(b)) FROM t1;
  }
} {32.0 real}
do_test tkt2251-1.3 {
  execsql {
    SELECT a, sum(b), typeof(sum(b)) FROM t1 GROUP BY a ORDER BY a;
  }
} {1 8.0 real 2 8.0 real 3 4.0 real 9 12.0 real}

# Make sure that the REAL value comes out when values are accessed
# by index.
#
do_test tkt2251-2.1 {
  execsql {
    SELECT b, typeof(b) FROM t1 WHERE a=3;
  }
} {4.0 real}
do_test tkt2251-2.2 {
  execsql {
    CREATE INDEX t1i1 ON t1(a,b);
    SELECT b, typeof(b) FROM t1 WHERE a=3;
  }
} {4.0 real}
do_test tkt2251-2.3 {
  execsql {
    REINDEX;
    SELECT b, typeof(b) FROM t1 WHERE a=3;
  }
} {4.0 real}

# Make sure the correct REAL value is used when copying from one
# table to another.
#
do_test tkt2251-3.1 {
  execsql {
    CREATE TABLE t2(x,y);
    INSERT INTO t2 SELECT * FROM t1;
    SELECT y, typeof(y) FROM t2 WHERE x=3;
  }
} {4.0 real}
do_test tkt2251-3.2 {
  execsql {
    CREATE TABLE t3 AS SELECT * FROM t1;
    SELECT b, typeof(b) FROM t3 WHERE a=3;
  }
} {4.0 real}


finish_test