TO_VECTOR() and VECTOR() are synonymous constructors of vectors. The functions take a string of type VARCHAR2 or CLOB as input and return a vector as output.

• TO_VECTOR
  TO_VECTOR is a constructor that takes a string of type VARCHAR2, CLOB, BLOB, or JSON as input, converts it to a vector, and returns a vector as output. TO_VECTOR also takes another vector as input, adjusts its format, and returns the adjusted vector as output. TO_VECTOR is synonymous with VECTOR.
• VECTOR
  VECTOR is synonymous with TO_VECTOR.