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18 lines
650 B
MySQL
18 lines
650 B
MySQL
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-- Add migration script here
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ALTER TABLE buffers ADD COLUMN latest_operation_epoch INTEGER;
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ALTER TABLE buffers ADD COLUMN latest_operation_lamport_timestamp INTEGER;
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ALTER TABLE buffers ADD COLUMN latest_operation_replica_id INTEGER;
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WITH ops AS (
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SELECT DISTINCT ON (buffer_id) buffer_id, epoch, lamport_timestamp, replica_id
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FROM buffer_operations
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ORDER BY buffer_id, epoch DESC, lamport_timestamp DESC, replica_id DESC
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)
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UPDATE buffers
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SET latest_operation_epoch = ops.epoch,
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latest_operation_lamport_timestamp = ops.lamport_timestamp,
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latest_operation_replica_id = ops.replica_id
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FROM ops
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WHERE buffers.id = ops.buffer_id;
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