Fix a problem in the enhanced PRAGMA integrity_check where it verifies

CHECK constraints: Do not be confused by the reuse of the Table.pCheck field
by VIEWs with named columns.  Problem discovered by OSS-Fuzz.

FossilOrigin-Name: 019dd3d5ba4a596c4ec3b5f0de8402c72196af0faca9138edbc0f1f4957cae60

manifest

@@ -1,5 +1,5 @@
-C If\sthe\suser\shas\snot\sset\sit\sexplicitly,\sset\sthe\s"PRAGMA\ssynchronous"\ssetting\sto\nSQLITE_DEFAULT_SYNCHRONOUS\swhen\sa\sdatabase\sconnection\schanges\sfrom\swal\sto\nrollback\sjournal\smode.
-D 2017-03-16T18:55:21.135
+C Fix\sa\sproblem\sin\sthe\senhanced\sPRAGMA\sintegrity_check\swhere\sit\sverifies\nCHECK\sconstraints:\sDo\snot\sbe\sconfused\sby\sthe\sreuse\sof\sthe\sTable.pCheck\sfield\nby\sVIEWs\swith\snamed\scolumns.\s\sProblem\sdiscovered\sby\sOSS-Fuzz.
+D 2017-03-17T03:21:14.865
 F Makefile.in 9605f4c49eace601d5c12c85dd6e037cc613a6d823e857614ba26b42f1285db0
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc 1faf9f06aadc9284c212dea7bbc7c0dea7e8337f0287c81001eff500912c790a
@@ -393,7 +393,7 @@ F src/parse.y 48b03113704ee8bd78ee6996d81de7fbee22e105
 F src/pcache.c 62835bed959e2914edd26afadfecce29ece0e870
 F src/pcache.h 2cedcd8407eb23017d92790b112186886e179490
 F src/pcache1.c e3967219b2a92b9edcb9324a4ba75009090d3953
-F src/pragma.c bfaa7e5cbfc8eacaa0f3611d5ec2dca1339d6d301f1e9b429b49ca460d794a60
+F src/pragma.c 2b244434e76c7075edbcfd9e4d634899af0944ff01183b126d4671f7407c2368
 F src/pragma.h c9c763958fec92b04125571472c9500b351c5f7f
 F src/prepare.c b1140c3d0cf59bc85ace00ce363153041b424b7a
 F src/printf.c 67427bbee66d891fc6f6f5aada857e9cdb368c1c
@@ -582,7 +582,7 @@ F test/capi3d.test 485048dc5cd07bc68011e4917ad035ad6047ab82
 F test/capi3e.test 3d49c01ef2a1a55f41d73cba2b23b5059ec460fe
 F test/cast.test 4c275cbdc8202d6f9c54a3596701719868ac7dc3
 F test/cffault.test 9d6b20606afe712374952eec4f8fd74b1a8097ef
-F test/check.test 92b23a91fb7be12fba7ee9ce518217e2919a21da
+F test/check.test fb823c1aee9d5187b4a474f1728bb65f2a77303255e294e250a2328ab7e72832
 F test/close.test 83947daf3b700631f90f4850ddaab455be4af73d
 F test/closure01.test b1703ba40639cfc9b295cf478d70739415eec6a4
 F test/coalesce.test cee0dccb9fbd2d494b77234bccf9dc6c6786eb91
@@ -1566,8 +1566,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 6d85eb5736781b43aa674d9544c7523b849b4e634f371702f8764b33e22e1e9f df39adeaa4d73a3d4ec831843b8ec7fd449f8b2137bdc7d7c320958d00e98db6
-R ce97b08e421fd719736eea9dd091c75c
-T +closed df39adeaa4d73a3d4ec831843b8ec7fd449f8b2137bdc7d7c320958d00e98db6
-U dan
-Z 3997e48cc61ec2c438e101b7960cfa80
+P 5c604479fda06714500959e121c719d1b6c8e54d1658eb9f560a4af95b7c5829
+R 5046d28129e3bd81658af4ffa15e3f46
+U drh
+Z bf308f7cb4f4a256732c0018ceafc10b

manifest.uuid

@@ -1 +1 @@
-5c604479fda06714500959e121c719d1b6c8e54d1658eb9f560a4af95b7c5829
+019dd3d5ba4a596c4ec3b5f0de8402c72196af0faca9138edbc0f1f4957cae60

src/pragma.c

@@ -1505,6 +1505,7 @@ void sqlite3Pragma(
         int iDataCur, iIdxCur;
         int r1 = -1;
 
+        if( pTab->tnum<1 ) continue;  /* Skip VIEWs or VIRTUAL TABLEs */
         if( pTab->pCheck==0
          && (pTab->tabFlags & TF_HasNotNull)==0
          && (pTab->pIndex==0 || isQuick)

test/check.test

@@ -481,6 +481,15 @@ do_catchsql_test 9.3 {
   UPDATE t1 SET c=a*2 WHERE a=1;
 } {1 {CHECK constraint failed: c-check}}
 
-
+# Integrity check on a VIEW with columns.
+#
+db close
+forcedelete test.db
+sqlite3 db test.db
+do_execsql_test 10.1 {
+  CREATE TABLE t1(x);
+  CREATE VIEW v1(y) AS SELECT x FROM t1;
+  PRAGMA integrity_check;
+} {ok}
 
 finish_test