expr.md
In duckplyr: A 'DuckDB'-Backed Version of 'dplyr'

can construct expressions

Code
  relexpr_reference("column")
Output
  List of 3
   $ name : chr "column"
   $ rel  : NULL
   $ alias: NULL
   - attr(*, "class")= chr [1:2] "relational_relexpr_reference" "relational_relexpr"
Code
  relexpr_constant(42)
Output
  List of 2
   $ val  : num 42
   $ alias: NULL
   - attr(*, "class")= chr [1:2] "relational_relexpr_constant" "relational_relexpr"
Code
  relexpr_function("+", list(relexpr_reference("column"), relexpr_constant(42,
    alias = "fortytwo")))
Output
  List of 3
   $ name : chr "+"
   $ args :List of 2
    ..$ :List of 3
    .. ..$ name : chr "column"
    .. ..$ rel  : NULL
    .. ..$ alias: NULL
    .. ..- attr(*, "class")= chr [1:2] "relational_relexpr_reference" "relational_relexpr"
    ..$ :List of 2
    .. ..$ val  : num 42
    .. ..$ alias: chr "fortytwo"
    .. ..- attr(*, "class")= chr [1:2] "relational_relexpr_constant" "relational_relexpr"
   $ alias: NULL
   - attr(*, "class")= chr [1:2] "relational_relexpr_function" "relational_relexpr"