Fixed merge error

Author: LucaCappelletti94

src/ast/mod.rs

@@ -68,9 +68,9 @@ pub use self::ddl::{
     DropBehavior, DropTrigger, GeneratedAs, GeneratedExpressionMode, IdentityParameters,
     IdentityProperty, IdentityPropertyFormatKind, IdentityPropertyKind, IdentityPropertyOrder,
     IndexColumn, IndexOption, IndexType, KeyOrIndexDisplay, NullsDistinctOption, Owner, Partition,
-    ProcedureParam, ReferentialAction, RenameTableNameKind, ReplicaIdentity, TableConstraint,
-    TagsColumnOption, TriggerObjectKind, UserDefinedTypeCompositeAttributeDef,
-    UserDefinedTypeRepresentation, ViewColumnDef,
+    ProcedureParam, ReferentialAction, RenameTableNameKind, ReplicaIdentity, TagsColumnOption,
+    TriggerObjectKind, UserDefinedTypeCompositeAttributeDef, UserDefinedTypeRepresentation,
+    ViewColumnDef,
 };
 pub use self::dml::{Delete, Insert};
 pub use self::operator::{BinaryOperator, UnaryOperator};