jdbc: escape syntax: scalar functions

[Totktonada]

{fn concat("Hello, ", "World!")} and so on.

Important note from the JDBC 4.2 standard:

The escape syntax for scalar functions must only be used to invoke the scalar
functions defined in Appendix C “Scalar Functions". The escape syntax is not
intended to be used to invoke user-defined or vendor specific scalar functions.

[Totktonada]

See also tarantool/tarantool@d4a7459 (land as 2.3.0-89-gd4a7459e7) and tarantool/doc#879

[nicktorwald]

See also tarantool/tarantool@d4a7459 (land as 2.3.0-89-gd4a7459e7) and tarantool/doc#879

Looks unrelated to escaped scalar functions (par. 13.4.1, p 114):

The escape syntax for scalar functions must only be used to invoke the scalar functions defined in Appendix C “Scalar Functions". The escape syntax is not intended to be used to invoke user-defined or vendor specific scalar functions.