fix json_extract function with stat4

sqlite/src/dttz.c

@@ -84,6 +84,12 @@ void register_date_functions(sqlite3 * db) {
     }
 }
 
+void func_needs_vdbe(sqlite3_context *context, FuncDef *pFunc, Vdbe *pVdbe)
+{
+    if (pFunc->xSFunc == currentTS || pFunc->xSFunc == nowFunc || pFunc->xSFunc == nextSequence)
+        context->pVdbe = pVdbe;
+}
+
 static int _convMem2ClientDatetime(Mem *pMem, void *out, int outlen,
         int *outdtsz, int isstring)
 {

sqlite/src/vdbeInt.h

@@ -814,6 +814,7 @@ int convMem2ClientDatetime(Mem *pMem, void *out);
 int convMem2ClientDatetimeStr(Mem *pMem, void *out, int outlen, int *outdtsz);
 int convDttz2ClientDatetime(const dttz_t *, const char *tzname, void *out, int sqltype);
 const char *get_clnt_tz();
+void func_needs_vdbe(sqlite3_context *context, FuncDef *pFunc, Vdbe *pVdbe);
 
 int sqliteVdbeMemDecimalBasicArithmetics(Mem *a, Mem *b, int opcode, Mem * res, int flipped);
 

sqlite/src/vdbemem.c

@@ -1726,7 +1726,15 @@ static int valueFromFunction(
   ctx.pOut = pVal;
   ctx.pFunc = pFunc;
 #if defined(SQLITE_BUILDING_FOR_COMDB2)
-  ctx.pVdbe = db->pVdbe;
+  /* Certain comdb2 functions save info in pVdbe, and we need set the pVdbe
+   * pointer in the function context.
+   * Example: now() needs the the default precision to work.
+   * Sqlite json on the other hand expectgs db pVdbe pointer to be NULL
+   * as it is using it to store internal json info. 
+   * Below function sets pVdbe in the function context only for comdb2
+   * variants that requires it.
+   */
+  func_needs_vdbe(&ctx, pFunc, db->pVdbe);
 #endif /* defined(SQLITE_BUILDING_FOR_COMDB2) */
   pFunc->xSFunc(&ctx, nVal, apVal);
   if( ctx.isError ){

tests/misstable_remsql.test/output_3.log

@@ -0,0 +1 @@
+(id=123, b1=x'59')

tests/misstable_remsql.test/test_missing.sh

@@ -13,6 +13,9 @@ a_cdb2config=$4
 a_dbdir=$5
 a_testdir=$6
 
+#TEST1 checking for missed table followed by good tables
+echo "TEST1 checking for missed table followed by good tables"
+
 output=run.out
 
 REM_CDB2_OPTIONS="--cdb2cfg ${a_remcdb2config}"
@@ -51,7 +54,6 @@ cdb2sql ${SRC_CDB2_OPTIONS} --host $mach $a_dbname "select * from LOCAL_${a_remd
 cdb2sql ${SRC_CDB2_OPTIONS} --tabs --host $mach $a_dbname "exec procedure sys.cmd.send(\"fdb info db\")" 2>&1 | cut -f 5- -d ' ' >> $output
 
 
-
 #convert the table to actual dbname
 sed "s/dorintdb/${a_remdbname}/g" output.log > output.log.actual
 
@@ -74,7 +76,8 @@ if [[ "$testcase_output" != "$expected_output" ]]; then
    exit 1
 fi
 
-#TEST2 start by accessing a missing table, followed by good tables
+#TEST2  following test one, again try to access a missing table, followed by good tables
+echo "TEST2  following test one, again try to access a missing table, followed by good tables"
 
 output=run.2.out
 
@@ -109,6 +112,7 @@ cdb2sql ${SRC_CDB2_OPTIONS} --host $mach $a_dbname "select dbname, tablename, in
 sed "s/dorintdb/${a_remdbname}/g" output_2.log > output_2.log.actual
 
 # validate results 
+
 testcase_output=$(cat $output)
 expected_output=$(cat output_2.log.actual)
 if [[ "$testcase_output" != "$expected_output" ]]; then
@@ -127,5 +131,44 @@ if [[ "$testcase_output" != "$expected_output" ]]; then
    exit 1
 fi
 
+#TEST3  check that json_extract works - patch for function context
+echo "TEST3  check that json_extract works - patch for function context"
+
+output=run.3.out
+
+cdb2sql ${REM_CDB2_OPTIONS} $a_remdbname default "analyze t" > $output 2>&1
+
+echo cdb2sql ${SRC_CDB2_OPTIONS} $a_dbname default "select * from LOCAL_${a_remdbname}.t where json_extract( '{\"bb\":123}', '$.bb') = id"
+cdb2sql ${SRC_CDB2_OPTIONS} $a_dbname default "select * from LOCAL_${a_remdbname}.t where json_extract( '{\"bb\":123}', '$.bb') = id" > $output 2>&1
+cdb2sql ${SRC_CDB2_OPTIONS} $a_dbname default "select * from LOCAL_${a_remdbname}.t where json_extract( '{\"bb\":123}', '$.bb' ) = id"
+
+if (( $? != 0 )) ; then
+    echo "Failure: select exit code $?"
+    exit 1
+fi
+
+#convert the table to actual dbname
+sed "s/dorintdb/${a_remdbname}/g" output_3.log > output_3.log.actual
+
+# validate results 
+
+testcase_output=$(cat $output)
+expected_output=$(cat output_3.log.actual)
+if [[ "$testcase_output" != "$expected_output" ]]; then
+
+   # print message 
+   echo "  ^^^^^^^^^^^^"
+   echo "The above testcase (${testcase}) has failed!!!" 
+   echo " "
+   echo "Use 'diff <expected-output> <my-output>' to see why:"
+   echo "> diff ${PWD}/{output_2.log.actual,$output}"
+   echo " "
+   diff output_3.log.actual $output
+   echo " "
+
+   # quit
+   exit 1
+fi
+
 
 echo "Testcase passed."