Unable to use multi-select with dynamic options on MySQL report

[ghost]

I am trying to use the database options to generate a dynamic multi-select, and that is rendering correctly. But, it is not generating the expected query and results. Any ideas?

Example header:
-- VARIABLE: {
-- name: "aldest",
-- display: "A/L Dest Airport",
-- type: "select",
-- multiple: true,
-- database_options: {table:"Example.active_branches", display:"id", column:"id", where:"1=1"}
-- }

Macro:
[aldest] => Array
(
[0] => ABE
[1] => BUF
[2] => CLE
)

Report Options Array:
[aldest] => Array
(
[name] => aldest
[display] => A/L Dest Airport
[type] => select
[multiple] => 1
[database_options] => Array
(
[table] => Example.active_branches
[display] => id
[column] => id
[where] => 1=1
)

                [empty] => 
                [format] => Y-m-d H:i:s
            )

Relevant line in my query from the .sql file:
-- A/L Dest Airport Range
and aldest = '{{ aldest }}'

Relevant line from Generated Query in Debug:
-- A/L Dest Airport Range
and aldest = 'Array'