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Extracts the hour from a date or timestamp value and returns it as the number of hours since 1970-01-01 00:00:00 UTC, according to the Iceberg partition transforms specification.

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Syntax

ICEBERG_HOUR(<value>)

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Parameters

ParameterDescriptionSupported input types
<value>The date or timestamp value to extract the hour from.DATE, TIMESTAMP, TIMESTAMPTZ

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Return type

INTEGER Returns the number of hours since 1970-01-01 00:00:00 UTC. For timestamps before this epoch, returns a negative value.

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Remarks

The ICEBERG_HOUR function can be used in the PARTITION BY clause of CREATE ICEBERG TABLE commands. 
CREATE ICEBERG TABLE events
  PARTITION BY (iceberg_hour(event_timestamp))
  AS SELECT * FROM source_events
WITH LOCATION = my_iceberg_location;

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Example

SELECT iceberg_hour('2025-12-15 14:30:00'::TIMESTAMP) AS hour_partition;
Returns:
hour_partition
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