Allow zero-length names for tables, columns, and indices.

Fix for ticket [78e04e52eaf].

FossilOrigin-Name: 7b1cfd65a6f7c85ef8f6e4622973457cff9d007c

manifest

@@ -1,8 +1,8 @@
 -----BEGIN PGP SIGNED MESSAGE-----
 Hash: SHA1
 
-C Add\stest\scases\sfor\sticket\s[abe728bbc311].
-D 2009-12-08T13:44:22
+C Allow\szero-length\snames\sfor\stables,\scolumns,\sand\sindices.\nFix\sfor\sticket\s[78e04e52eaf].
+D 2009-12-08T14:34:08
 F Makefile.arm-wince-mingw32ce-gcc fcd5e9cd67fe88836360bb4f9ef4cb7f8e2fb5a0
 F Makefile.in c5827ead754ab32b9585487177c93bb00b9497b3
 F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@ -114,7 +114,7 @@ F src/btmutex.c 96a12f50f7a17475155971a241d85ec5171573ff
 F src/btree.c efdef3953c49e28f8b8fa9cc0ac5754cc1a7489a
 F src/btree.h 7944a9dac59eb3e541aad45fd2747f1051e7c63d
 F src/btreeInt.h 54f4245decd0409ea52cf9aee422d3d761d7ac10
-F src/build.c a48e74d24897100017d39ceba5de255e53ec9488
+F src/build.c 5a18b6846e99cb923008a8c888d3fd520f0bea52
 F src/callback.c 908f3e0172c3d4058f4ca0acd42c637c52e9669f
 F src/complete.c 417df1ef5ea798532bb6290b0cc4265fef82980a
 F src/date.c a79c0a8f219370b972e320741f995a3bef9df33f
@@ -605,6 +605,7 @@ F test/tkt-2ea2425d34.test 1cf13e6f75d149b3209a0cb32927a82d3d79fb28
 F test/tkt-3fe897352e.test 8084dad39807eac10b10720c84193bd1a5980973
 F test/tkt-4a03edc4c8.test 2865e4edbc075b954daa82f8da7cc973033ec76e
 F test/tkt-5ee23731f.test 3581260f2a71e51db94e1506ba6b0f7311d002a9
+F test/tkt-78e04e52ea.test fb5430c675e708f5cbafdf3e7e5593da5145a527
 F test/tkt-94c04eaadb.test be5ea61cb04dfdc047d19b5c5a9e75fa3da67a7f
 F test/tkt-d82e3f3721.txt cbed12b1a1e4740382de43ef1bb45c6bc0f8f473
 F test/tkt-f777251dc7a.test 6f24c053bc5cdb7e1e19be9a72c8887cf41d5e87
@@ -779,14 +780,14 @@ F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
 F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
 F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
-P f43e37e0a4cc7c15c996f4404dc775636396567d
-R a6057ef92cd48c83669480ba55d2643b
+P 4eb9bf0b93a564844f133691936593245aa792fc
+R 7eeb7797797e30a8ad051eacc36b8fb3
 U drh
-Z fd58c7a3cb08c42b6b4250242de672b0
+Z e526c487a3b49cc4dcbee58d5a1860ea
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manifest.uuid

@@ -1 +1 @@
-4eb9bf0b93a564844f133691936593245aa792fc
+7b1cfd65a6f7c85ef8f6e4622973457cff9d007c

src/build.c

@@ -549,7 +549,8 @@ void sqlite3UnlinkAndDeleteTable(sqlite3 *db, int iDb, const char *zTabName){
 
   assert( db!=0 );
   assert( iDb>=0 && iDb<db->nDb );
-  assert( zTabName && zTabName[0] );
+  assert( zTabName );
+  testcase( zTabName[0]==0 );  /* Zero-length table names are allowed */
   pDb = &db->aDb[iDb];
   p = sqlite3HashInsert(&pDb->pSchema->tblHash, zTabName,
                         sqlite3Strlen30(zTabName),0);

test/tkt-78e04e52ea.test

@@ -0,0 +1,68 @@
+# 2009 December 8
+#
+# 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.
+#
+# Verify that we can create zero-length tables.
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+do_test tkt-78e04-1.0 {
+  execsql {
+    CREATE TABLE ""("" UNIQUE);
+    CREATE TABLE t2(x);
+    INSERT INTO "" VALUES(1);
+    INSERT INTO t2 VALUES(2);
+    SELECT * FROM "", t2;
+  }
+} {1 2}
+do_test tkt-78e04-1.1 {
+  catchsql {
+    INSERT INTO "" VALUES(1);
+  }
+} {1 {column  is not unique}}
+do_test tkt-78e04-1.2 {
+  execsql {
+    PRAGMA table_info("");
+  }
+} {0 {} {} 0 {} 0}
+do_test tkt-78e04-1.3 {
+  execsql {
+    CREATE INDEX i1 ON ""("" COLLATE nocase);
+  }
+} {}
+do_test tkt-78e04-1.4 {
+  execsql {
+    EXPLAIN QUERY PLAN SELECT * FROM "" WHERE "" LIKE 'abc%';
+  }
+} {0 0 {TABLE }}
+do_test tkt-78e04-1.5 {
+  execsql {
+    DROP TABLE "";
+    SELECT name FROM sqlite_master;
+  }
+} {t2}
+
+do_test tkt-78e04-2.1 {
+  execsql {
+    CREATE INDEX "" ON t2(x);
+    EXPLAIN QUERY PLAN SELECT * FROM t2 WHERE x=5;
+  }
+} {0 0 {TABLE t2 WITH INDEX }}
+do_test tkt-78e04-2.2 {
+  execsql {
+    DROP INDEX "";
+    EXPLAIN QUERY PLAN SELECT * FROM t2 WHERE x=2;
+  }
+} {0 0 {TABLE t2}}
+
+finish_test