docs: add examples for list_cat, list_concat, and list_repeat functions

Author: kosiew

docs/source/user-guide/common-operations/expressions.rst

@@ -110,6 +110,35 @@ This function returns an integer indicating the total number of elements in the
 
 In this example, the `num_elements` column will contain `3` for both rows.
 
+To concatenate two arrays, you can use the function :py:func:`datafusion.functions.list_cat` or :py:func:`datafusion.functions.list_concat`.
+These functions return a new array that is the concatenation of the input arrays.
+
+.. ipython:: python
+
+    from datafusion import SessionContext, col
+    from datafusion.functions import list_cat, list_concat
+
+    ctx = SessionContext()
+    df = ctx.from_pydict({"a": [[1, 2, 3]], "b": [[4, 5, 6]]})
+    df.select(list_cat(col("a"), col("b")).alias("concatenated_array"))
+
+In this example, the `concatenated_array` column will contain `[1, 2, 3, 4, 5, 6]`.
+
+To repeat the elements of an array a specified number of times, you can use the function :py:func:`datafusion.functions.list_repeat`.
+This function returns a new array with the elements repeated.
+
+.. ipython:: python
+
+    from datafusion import SessionContext, col
+    from datafusion.functions import list_repeat
+
+    ctx = SessionContext()
+    df = ctx.from_pydict({"a": [[1, 2, 3]]})
+    df.select(list_repeat(col("a"), 2).alias("repeated_array"))
+
+In this example, the `repeated_array` column will contain `[[1, 2, 3], [1, 2, 3]]`.
+
+
 Structs
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