risingwave_expr_impl::scalar::array_concat

Function array_prepend

Source 
fn array_prepend(
    left: Option<ScalarRefImpl<'_>>,
    right: Option<ListRef<'_>>,
    ctx: &Context,
) -> ListValue
Expand description

Prepends a value as the front element of an array. The behavior is the same as PG.

Examples:

query T
select array_prepend(123, array[66]);
----
{123,66}

query T
select array_prepend(null::int, array[66]);
----
{NULL,66}

query T
select array_prepend(233, null::int[]);
----
{233}

query T
select array_prepend(null::int, null::int[]);
----
{NULL}