Disable the transfer optimization if the destination table contains

any foreign key constraint and foreign key constraints are enabled.
Ticket [6284df89debdf].

FossilOrigin-Name: ddeea5ab5f6c0c4a86cdfbbb9f24d9d54bf8d301

manifest

@@ -1,5 +1,5 @@
-C Add\sthe\s"getlock"\sutility\sfor\sdetermining\sif\sa\sdatabase\sfile\s(on\sunix)\sis\ncurrently\slocked.
-D 2011-04-22T22:55:10.113
+C Disable\sthe\stransfer\soptimization\sif\sthe\sdestination\stable\scontains\nany\sforeign\skey\sconstraint\sand\sforeign\skey\sconstraints\sare\senabled.\nTicket\s[6284df89debdf].
+D 2011-04-24T22:56:07.596
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in 7a4d9524721d40ef9ee26f93f9bd6a51dba106f2
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -138,7 +138,7 @@ F src/global.c 02335177cf6946fe5525c6f0755cf181140debf3
 F src/hash.c 458488dcc159c301b8e7686280ab209f1fb915af
 F src/hash.h 2894c932d84d9f892d4b4023a75e501f83050970
 F src/hwtime.h d32741c8f4df852c7d959236615444e2b1063b08
-F src/insert.c acfb89fe4a73d703e425e167bfcc72985f4299ae
+F src/insert.c cdee360e5cea59db6c4a980e4360499631222af6
 F src/journal.c 552839e54d1bf76fb8f7abe51868b66acacf6a0e
 F src/legacy.c a199d7683d60cef73089e892409113e69c23a99f
 F src/lempar.c 7f026423f4d71d989e719a743f98a1cbd4e6d99e
@@ -505,7 +505,7 @@ F test/init.test 15c823093fdabbf7b531fe22cf037134d09587a7
 F test/insert.test aef273dd1cee84cc92407469e6bd1b3cdcb76908
 F test/insert2.test 4f3a04d168c728ed5ec2c88842e772606c7ce435
 F test/insert3.test 1b7db95a03ad9c5013fdf7d6722b6cd66ee55e30
-F test/insert4.test c1469999a58e86a85b74df645a820f4cc7a8273b
+F test/insert4.test b3e02648a5fc3075c29e13c369b5127bf859b5a2
 F test/insert5.test 1f93cbe9742110119133d7e8e3ccfe6d7c249766
 F test/intarray.test 066b7d7ac38d25bf96f87f1b017bfc687551cdd4
 F test/interrupt.test 42e7cf98646fd9cb4a3b131a93ed3c50b9e149f1
@@ -930,7 +930,7 @@ F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
 F tool/split-sqlite3c.tcl d9be87f1c340285a3e081eb19b4a247981ed290c
 F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
-P d8b149f5e465f7794739ed0210e1e5c53110ee9a
-R 46d4cc9c199137dd735f2ac252175f1e
+P 0ab24b133e332ad7f4517b8e113e9c241ee9af9f
+R 40e74cf200b39d155b455f390ce862eb
 U drh
-Z 48df56ba9c3ee078a0d4702e2f08ce89
+Z 87bc3e585b95e6d3397bca153c02ab82

manifest.uuid

@@ -1 +1 @@
-0ab24b133e332ad7f4517b8e113e9c241ee9af9f
+ddeea5ab5f6c0c4a86cdfbbb9f24d9d54bf8d301

src/insert.c

@@ -1734,6 +1734,18 @@ static int xferOptimization(
     return 0;   /* Tables have different CHECK constraints.  Ticket #2252 */
   }
 #endif
+#ifndef SQLITE_OMIT_FOREIGN_KEY
+  /* Disallow the transfer optimization if the destination table constains
+  ** any foreign key constraints.  This is more restrictive than necessary.
+  ** But the main beneficiary of the transfer optimization is the VACUUM 
+  ** command, and the VACUUM command disables foreign key constraints.  So
+  ** the extra complication to make this rule less restrictive is probably
+  ** not worth the effort.  Ticket [6284df89debdfa61db8073e062908af0c9b6118e]
+  */
+  if( (pParse->db->flags & SQLITE_ForeignKeys)!=0 && pDest->pFKey!=0 ){
+    return 0;
+  }
+#endif
 
   /* If we get this far, it means either:
   **

test/insert4.test

@@ -326,4 +326,64 @@ do_test insert4-6.7 {
   }
 } {1 {constraint failed}}
 
+# Ticket [6284df89debdfa61db8073e062908af0c9b6118e]
+# Disable the xfer optimization if the destination table contains
+# a foreign key constraint
+#
+ifcapable foreignkey {
+  do_test insert4-7.1 {
+    set ::sqlite3_xferopt_count 0
+    execsql {
+      CREATE TABLE t7a(x INTEGER PRIMARY KEY); INSERT INTO t7a VALUES(123);
+      CREATE TABLE t7b(y INTEGER REFERENCES t7a);
+      CREATE TABLE t7c(z INT);  INSERT INTO t7c VALUES(234);
+      INSERT INTO t7b SELECT * FROM t7c;
+      SELECT * FROM t7b;
+    }
+  } {234}
+  do_test insert4-7.2 {
+    set ::sqlite3_xferopt_count
+  } {1}
+  do_test insert4-7.3 {
+    set ::sqlite3_xferopt_count 0
+    execsql {
+      DELETE FROM t7b;
+      PRAGMA foreign_keys=ON;
+    }
+    catchsql {
+      INSERT INTO t7b SELECT * FROM t7c;
+    }
+  } {1 {foreign key constraint failed}}
+  do_test insert4-7.4 {
+    execsql {SELECT * FROM t7b}
+  } {}
+  do_test insert4-7.5 {
+    set ::sqlite3_xferopt_count
+  } {0}
+  do_test insert4-7.6 {
+    set ::sqlite3_xferopt_count 0
+    execsql {
+      DELETE FROM t7b; DELETE FROM t7c;
+      INSERT INTO t7c VALUES(123);
+      INSERT INTO t7b SELECT * FROM t7c;
+      SELECT * FROM t7b;
+    }
+  } {123}
+  do_test insert4-7.7 {
+    set ::sqlite3_xferopt_count
+  } {0}
+  do_test insert4-7.7 {
+    set ::sqlite3_xferopt_count 0
+    execsql {
+      PRAGMA foreign_keys=OFF;
+      DELETE FROM t7b;
+      INSERT INTO t7b SELECT * FROM t7c;
+      SELECT * FROM t7b;
+    }
+  } {123}
+  do_test insert4-7.8 {
+    set ::sqlite3_xferopt_count
+  } {1}
+}
+
 finish_test