Fixed CORE-1528 - Functions DATEDIFF, ABS(integer const) does not work in dialect 1

src/dsql/dsql.cpp

@@ -672,7 +672,7 @@ static ISC_STATUS dsql8_execute_immediate_common(ISC_STATUS*	user_status,
  * be a way to send the parser version to DSQL so that the parser can compare the keyword
  * version to the parser version.  To accomplish this, the parser version is combined with
  * the client dialect and sent across that way.  In dsql8_execute_immediate, the parser version
- * and client dialect are separated and passed on to their final desintations.  The information
+ * and client dialect are separated and passed on to their final destinations.  The information
  * is combined as follows:
  *     Dialect * 10 + parser_version
  *

src/dsql/utld.cpp

@@ -1056,4 +1056,9 @@ UCHAR DSqlDataTypeUtil::maxBytesPerChar(UCHAR charSet)
 	return METD_get_charset_bpc(request, charSet);
 }
 
+USHORT DSqlDataTypeUtil::getDialect()
+{
+	return request->req_client_dialect;
+}
+
 #endif

src/dsql/utld_proto.h

@@ -56,6 +56,7 @@ public:
 
 public:
 	virtual UCHAR maxBytesPerChar(UCHAR charSet);
+	virtual USHORT getDialect();
 
 private:
 	dsql_req* request;

src/jrd/DataTypeUtil.cpp

@@ -535,11 +535,14 @@ void DataTypeUtilBase::makeSysFunction(dsc* result, const char* name, int argsCo
 
 namespace Jrd {
 
-
 UCHAR DataTypeUtil::maxBytesPerChar(UCHAR charSet)
 {
 	return INTL_charset_lookup(tdbb, charSet)->maxBytesPerChar();
 }
 
+USHORT DataTypeUtil::getDialect()
+{
+	return (tdbb->tdbb_database->dbb_flags & DBB_DB_SQL_dialect_3) ? 3 : 1;
+}
 
 }	// namespace Jrd

src/jrd/DataTypeUtil.h

@@ -50,6 +50,7 @@ public:
 
 public:
 	virtual UCHAR maxBytesPerChar(UCHAR charSet) = 0;
+	virtual USHORT getDialect() = 0;
 };
 
 
@@ -67,6 +68,7 @@ public:
 
 public:
 	virtual UCHAR maxBytesPerChar(UCHAR charSet);
+	virtual USHORT getDialect();	// returns client dialect in DSQL and database dialect in JRD
 
 private:
 	thread_db* tdbb;

src/jrd/SysFunction.cpp

@@ -351,7 +351,10 @@ static void makeFromListResult(DataTypeUtilBase* dataTypeUtil, const SysFunction
 
 static void makeInt64Result(DataTypeUtilBase* dataTypeUtil, const SysFunction* function, dsc* result, int argsCount, const dsc** args)
 {
-	result->makeInt64(0);
+	if (dataTypeUtil->getDialect() == 1)
+		result->makeDouble();
+	else
+		result->makeInt64(0);
 
 	bool isNullable;
 	if (initResult(result, argsCount, args, &isNullable))