Experimental opimizations to speed up FK constraint CASCADE and SET NULL action processing.

FossilOrigin-Name: 35a20a5f22245c70faa51965951e8cc011defa93

test/fkey8.test

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+# 2001 September 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.
+#
+# This file implements tests for foreign keys.
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+set testprefix fkey8
+
+ifcapable {!foreignkey} {
+  finish_test
+  return
+}
+do_execsql_test 1.0 { PRAGMA foreign_keys = 1; }
+
+
+foreach {tn use_stmt sql schema} {
+  1   1 "DELETE FROM p1" {
+    CREATE TABLE p1(a PRIMARY KEY);
+    CREATE TABLE c1(b REFERENCES p1);
+  }
+
+  2.1     0 "DELETE FROM p1" {
+    CREATE TABLE p1(a PRIMARY KEY);
+    CREATE TABLE c1(b REFERENCES p1 ON DELETE CASCADE);
+  }
+  2.2   0 "DELETE FROM p1" {
+    CREATE TABLE p1(a PRIMARY KEY);
+    CREATE TABLE c1(b REFERENCES p1 ON DELETE SET NULL);
+  }
+  2.3   1 "DELETE FROM p1" {
+    CREATE TABLE p1(a PRIMARY KEY);
+    CREATE TABLE c1(b REFERENCES p1 ON DELETE SET DEFAULT);
+  }
+
+  3   1 "DELETE FROM p1" {
+    CREATE TABLE p1(a PRIMARY KEY);
+    CREATE TABLE c1(b REFERENCES p1 ON DELETE CASCADE);
+    CREATE TRIGGER ct1 AFTER DELETE ON c1 BEGIN
+      INSERT INTO p1 VALUES('x');
+    END;
+  }
+
+  4   1 "DELETE FROM p1" {
+    CREATE TABLE p1(a PRIMARY KEY);
+    CREATE TABLE c1(b REFERENCES p1 ON DELETE CASCADE, c PRIMARY KEY);
+    CREATE TABLE cc1(d REFERENCES c1);
+  }
+
+  5.1   0 "DELETE FROM p1" {
+    CREATE TABLE p1(a PRIMARY KEY);
+    CREATE TABLE c1(b REFERENCES p1 ON DELETE CASCADE, c PRIMARY KEY);
+    CREATE TABLE cc1(d REFERENCES c1 ON DELETE CASCADE);
+  }
+  5.2   0 "DELETE FROM p1" {
+    CREATE TABLE p1(a PRIMARY KEY);
+    CREATE TABLE c1(b REFERENCES p1 ON DELETE CASCADE, c PRIMARY KEY);
+    CREATE TABLE cc1(d REFERENCES c1 ON DELETE SET NULL);
+  }
+
+} {
+  drop_all_tables
+  do_test 1.$tn {
+    execsql $schema
+    set stmt [sqlite3_prepare_v2 db $sql -1 dummy]
+    set ret [uses_stmt_journal $stmt]
+    sqlite3_finalize $stmt
+    set ret
+  } $use_stmt
+}
+
+
+
+
+finish_test