AlterQuery  tab (children 2)
 ExpressionList (children 1)
  AlterCommand ADD_INDEX (children 1)
   Index (children 2)
    Identifier vec
    Function vector_similarity (children 1)
     ExpressionList (children 3)
      Literal \'hnsw\'
      Literal \'cosineDistance\'
      Literal UInt64_1
 Identifier tab
