Fix #44: correctly deal with DEFAULT value ""

Author: Mytherin

data/db/issue44.db

@@ -166,7 +166,7 @@ void SQLiteDB::GetTableInfo(const string &table_name, ColumnList &columns, vecto
 		auto column_type = all_varchar ? LogicalType::VARCHAR : SQLiteUtils::TypeToLogicalType(sqlite_type);
 
 		ColumnDefinition column(std::move(sqlite_colname), std::move(column_type));
-		if (!default_value.empty()) {
+		if (!default_value.empty() && default_value != "\"\"") {
 			auto expressions = Parser::ParseExpressionList(default_value);
 			if (expressions.empty()) {
 				throw InternalException("Expression list is empty");

src/sqlite_db.cpp

@@ -0,0 +1,24 @@
+# name: test/sql/scanner/issue44.test
+# description: Test issue #44
+# group: [sqlite_scanner]
+
+require sqlite_scanner
+
+query IIIIIII
+SELECT * FROM sqlite_scan('data/db/issue44.db', 'clusters_and_visits')
+----
+
+query IIIIIII
+SELECT * FROM sqlite_scan('data/db/issue44.db', 'clusters')
+----
+
+statement ok
+ATTACH 'data/db/issue44.db' AS test_db
+
+query IIIIIII
+SELECT * FROM test_db.clusters_and_visits
+----
+
+query IIIIIII
+SELECT * FROM test_db.clusters
+----