Add interval to supported types

Author: AmrDeveloper

crates/gitql-core/src/types_table.rs

@@ -5,6 +5,7 @@ use gitql_ast::types::date::DateType;
 use gitql_ast::types::datetime::DateTimeType;
 use gitql_ast::types::float::FloatType;
 use gitql_ast::types::integer::IntType;
+use gitql_ast::types::interval::IntervalType;
 use gitql_ast::types::text::TextType;
 use gitql_ast::types::time::TimeType;
 use gitql_ast::types::DataType;
@@ -78,6 +79,7 @@ fn register_primitives_types(types_map: &mut HashMap<&'static str, Box<dyn DataT
     types_map.insert("date", Box::new(DateType));
     types_map.insert("time", Box::new(TimeType));
     types_map.insert("datetime", Box::new(DateTimeType));
+    types_map.insert("interval", Box::new(IntervalType));
 
     // SQL Type Aliases
     types_map.insert("int", Box::new(IntType));

crates/gitql-parser/src/parse_type.rs

@@ -62,11 +62,11 @@ fn parse_primitive_type(
     let type_name_token = consume_conditional_token_or_errors(
         tokens,
         position,
-        |token| matches!(token.kind, TokenKind::Symbol(_)),
+        |token| matches!(token.kind, TokenKind::Symbol(_) | TokenKind::Interval),
         "Expect Symbol to represent Type name",
     )?;
 
-    let type_literal = type_name_token.to_string();
+    let type_literal = type_name_token.to_string().to_lowercase();
     if let Some(data_type) = env.types_table.lookup(type_literal.as_str()) {
         return Ok(data_type);
     }