query builder progress

include/matador/sql/dialect.hpp

@@ -137,6 +137,7 @@ public:
   [[nodiscard]] const std::string& column() const;
   [[nodiscard]] const std::string& columns() const;
   [[nodiscard]] const std::string& commit() const;
+  [[nodiscard]] const std::string& constraint() const;
   [[nodiscard]] const std::string& create() const;
   [[nodiscard]] const std::string& desc() const;
   [[nodiscard]] const std::string& distinct() const;
@@ -201,6 +202,7 @@ private:
     {dialect_token::Column,      "COLUMN"},
     {dialect_token::Columns,     "COLUMNS"},
     {dialect_token::Commit,      "COMMIT TRANSACTION"},
+    {dialect_token::Constraint,  "CONSTRAINT"},
     {dialect_token::Create,      "CREATE"},
     {dialect_token::Desc,        "DESC"},
     {dialect_token::Distinct,    "DISTINCT"},

include/matador/sql/dialect_token.hpp

@@ -19,6 +19,7 @@ enum class dialect_token : uint8_t {
   Column,
   Columns,
   Commit,
+  Constraint,
   Create,
   Database,
   Desc,