feat: add arrow_cast function to cast expressions to specified data types

Author: kosiew

python/datafusion/functions.py

@@ -82,6 +82,7 @@
     "array_to_string",
     "array_union",
     "arrow_typeof",
+    "arrow_cast",
     "ascii",
     "asin",
     "asinh",
@@ -1099,6 +1100,11 @@ def arrow_typeof(arg: Expr) -> Expr:
     return Expr(f.arrow_typeof(arg.expr))
 
 
+def arrow_cast(expr: Expr, data_type: str) -> Expr:
+    """Casts an expression to a specified data type."""
+    return Expr(f.arrow_cast(expr.expr, data_type))
+
+
 def random() -> Expr:
     """Returns a random value in the range ``0.0 <= x < 1.0``."""
     return Expr(f.random())