Resolve "Improve GENERATED support"

pglablib/catalog/PgSequence.cpp

@@ -19,5 +19,60 @@ QString PgSequence::createSql() const
 
 	// [ OWNED BY { table_name.column_name | NONE } ]
 	sql += ";";
-	return sql;
+    return sql;
+}
+
+int64_t PgSequence::defaultMin() const
+{
+    if (direction() == Ascending)
+        return 1;
+
+    if (typid == Pgsql::int8_oid)
+        return std::numeric_limits<int64_t>::min();
+    return std::numeric_limits<int32_t>::min();
+}
+
+int64_t PgSequence::defaultMax() const
+{
+    if (direction() == Descending)
+        return -1;
+
+    if (typid == Pgsql::int8_oid)
+        return std::numeric_limits<int64_t>::max();
+    return std::numeric_limits<int32_t>::max();
+}
+
+int64_t PgSequence::defaultStart() const
+{
+    if (direction() == Descending)
+        return max;
+    return min;
+}
+
+int64_t PgSequence::defaultIncrement() const
+{
+    // Direction should not be considered here
+    // a negative increment is what makes it a descending sequence
+    return 1;
+}
+
+int64_t PgSequence::defaultCache() const
+{
+    return 1;
+}
+
+QString PgSequence::nonDefaultOptionsString() const
+{
+    QString options;
+    if (increment != defaultIncrement())
+        options += QString("INCREMENT %1 ").arg(increment);
+    if (min != defaultMin())
+        options += QString("MINVALUE %1 ").arg(min);
+    if (max != defaultMax())
+        options += QString("MAXVALUE %1 ").arg(max);
+    if (start != defaultStart())
+        options += QString("START %1 ").arg(start);
+    if (cache != defaultCache())
+        options += QString("CACHE %1 ").arg(cache);
+    return options.trimmed();
 }