REVERSE

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Syntax

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String or array

reverse(value)

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Arguments

• T is the array element type: BOOLEAN, TINYINT, SMALLINT, INTEGER, BIGINT, FLOAT, DOUBLE, DECIMAL(p, s), STRING, BINARY, DATE, TIME, TIMESTAMP, ARRAY, MAP or STRUCT.

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String

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Array

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Returns

• Type: STRING for string input; ARRAY<T> for array input
• Possible values: The input Unicode code points in reverse order.
• NULL behavior: Returns NULL for NULL input.
• Shape: String code points are reversed, or array length and element type are retained.
• Ordering: Reverse input encounter order.

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Array

• Type: ARRAY<T>
• Possible values: The same elements in reverse order.
• NULL behavior: Returns NULL for NULL array; retains NULL elements.
• Shape: Same length and element type as the input.
• Ordering: Reverse input order.

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Properties

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Usage notes

• INTEGER and INT mean the same type; STRING means VARCHAR text. NULL can be used with a supported type. Cast NULL explicitly when its type would otherwise be unclear.

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Examples

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Typical behavior (string)

SELECT reverse('aé🚀') AS reversed;

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Typical behavior (array)

SELECT reverse(ARRAY[1, NULL, 2]) AS "value";