Have the rtree module close any open blob-handle within the xSavepoint method.

This prevents such an open blob handle from interfering with DROP TABLE
operations.

FossilOrigin-Name: fa4416adc2a9a3a80db1d5befc0b95c3d0fc41affe38f7f2f45cdfae3f1b49eb

ext/rtree/rtree.c

@@ -3205,6 +3205,28 @@ static int rtreeRename(sqlite3_vtab *pVtab, const char *zNewName){
   return rc;
 }
 
+/*
+** The xSavepoint method.
+**
+** This module does not need to do anything to support savepoints. However,
+** it uses this hook to close any open blob handle. This is done because a 
+** DROP TABLE command - which fortunately always opens a savepoint - cannot 
+** succeed if there are any open blob handles. i.e. if the blob handle were
+** not closed here, the following would fail:
+**
+**   BEGIN;
+**     INSERT INTO rtree...
+**     DROP TABLE <tablename>;    -- Would fail with SQLITE_LOCKED
+**   COMMIT;
+*/
+static int rtreeSavepoint(sqlite3_vtab *pVtab, int iSavepoint){
+  Rtree *pRtree = (Rtree *)pVtab;
+  int iwt = pRtree->inWrTrans;
+  pRtree->inWrTrans = 0;
+  nodeBlobReset(pRtree);
+  pRtree->inWrTrans = iwt;
+  return SQLITE_OK;
+}
 
 /*
 ** This function populates the pRtree->nRowEst variable with an estimate
@@ -3251,7 +3273,7 @@ static int rtreeQueryStat1(sqlite3 *db, Rtree *pRtree){
 }
 
 static sqlite3_module rtreeModule = {
-  0,                          /* iVersion */
+  2,                          /* iVersion */
   rtreeCreate,                /* xCreate - create a table */
   rtreeConnect,               /* xConnect - connect to an existing table */
   rtreeBestIndex,             /* xBestIndex - Determine search strategy */
@@ -3271,7 +3293,7 @@ static sqlite3_module rtreeModule = {
   rtreeEndTransaction,        /* xRollback - rollback transaction */
   0,                          /* xFindFunction - function overloading */
   rtreeRename,                /* xRename - rename the table */
-  0,                          /* xSavepoint */
+  rtreeSavepoint,             /* xSavepoint */
   0,                          /* xRelease */
   0,                          /* xRollbackTo */
 };

ext/rtree/rtree1.test

@@ -39,6 +39,8 @@ set testprefix rtree1
 #               inserted. Also that if a non-numeric is inserted into one
 #               of the min/max dimension columns, it is converted to the
 #               required type before being inserted.
+#   rtree-15.*: Check that DROP TABLE works within a transaction that
+#               writes to an r-tree table.
 #
 
 ifcapable !rtree {
@@ -592,4 +594,20 @@ do_execsql_test 14.5 {
   3 42 49
 }
 
+#-------------------------------------------------------------------------
+#
+do_execsql_test 15.0 {
+  CREATE VIRTUAL TABLE rt USING rtree(id, x1,x2, y1,y2);
+  CREATE TEMP TABLE t13(a, b, c);
+}
+do_execsql_test 15.1 {
+  BEGIN;
+  INSERT INTO rt VALUES(1,2,3,4,5);
+}
+breakpoint
+do_execsql_test 15.2 {
+  DROP TABLE t13;
+  COMMIT;
+}
+
 finish_test

manifest

@@ -1,5 +1,5 @@
-C Fix\sthe\squoting\smechanism\sfor\s".dump"\sso\sthat\sit\sis\snot\sapplied\sfor\sthe\n".mode\squote"\soutput.
-D 2017-04-08T13:42:55.616
+C Have\sthe\srtree\smodule\sclose\sany\sopen\sblob-handle\swithin\sthe\sxSavepoint\smethod.\nThis\sprevents\ssuch\san\sopen\sblob\shandle\sfrom\sinterfering\swith\sDROP\sTABLE\noperations.
+D 2017-04-08T13:52:41.332
 F Makefile.in 1cc758ce3374a32425e4d130c2fe7b026b20de5b8843243de75f087c0a2661fb
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc a4c0613a18663bda56d8cf76079ab6590a7c3602e54befb4bbdef76bcaa38b6a
@@ -271,9 +271,9 @@ F ext/rbu/sqlite3rbu.c 2a89efba9eeba8e6c89a498dc195e8efbdde2694
 F ext/rbu/sqlite3rbu.h 6fb6294c34a9ca93b5894a33bca530c6f08decba
 F ext/rbu/test_rbu.c 5aa22616afac6f71ebd3d9bc9bf1006cfabcca88
 F ext/rtree/README 6315c0d73ebf0ec40dedb5aa0e942bc8b54e3761
-F ext/rtree/rtree.c fb7c0e62ccbbbd6951ddb1f52feaa2c1a53b7ac1c6f2d5d5e2bbd31c33e57186
+F ext/rtree/rtree.c 37c603c6b8aed1a760661ceb5a025bd36bac14cf56d59949bd8de14b2a17e9ed
 F ext/rtree/rtree.h 834dbcb82dc85b2481cde6a07cdadfddc99e9b9e
-F ext/rtree/rtree1.test 42dadfc7b44a436cd74a1bebc0b9b689e4eaf7ec
+F ext/rtree/rtree1.test d5f0ba215b3bd1d05269ada86e74073b8445852aa0d33a63e10ec63a09c39473
 F ext/rtree/rtree2.test acbb3a4ce0f4fbc2c304d2b4b784cfa161856bba
 F ext/rtree/rtree3.test 2cafe8265d1ff28f206fce88d114f208349df482
 F ext/rtree/rtree4.test c8fe384f60ebd49540a5fecc990041bf452eb6e0
@@ -1570,7 +1570,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P a921ada89050ce1d162fd1b0056939573635e2cec7ac0c2a99ae924b3ae593f7
-R 82737b36216e366238632e12de53d03d
-U drh
-Z 97234581d28b10577d1d04c415271f72
+P 78c1e90305d48917d9423d8e50a7dfd15ec27aa93cb421610062229c7ede13a6
+R 0c38afb8d28742bfd99c862428490c09
+U dan
+Z 475b2e97335280e83d36c7e778a71dcc

manifest.uuid

@@ -1 +1 @@
-78c1e90305d48917d9423d8e50a7dfd15ec27aa93cb421610062229c7ede13a6
+fa4416adc2a9a3a80db1d5befc0b95c3d0fc41affe38f7f2f45cdfae3f1b49eb