AlterQuery  tab2 (children 2)
 ExpressionList (children 1)
  AlterCommand ADD_INDEX (children 1)
   Index (children 2)
    Identifier vec
    Function vector_similarity (children 1)
     ExpressionList (children 3)
      Identifier hnsw
      Identifier L2Distance
      Literal UInt64_1
 Identifier tab2
