ravindrabajpai opened a new issue, #12431:
URL: https://github.com/apache/iceberg/issues/12431
### Proposed Change
I have recently started exploring iceberg table format, and I feel hidden
partitioning is a very powerful feature. I would like to explore it a bit
further to see if following case can be possible. Please ignore this proposal
and point me to an alternate solution if there is any.
I would like to explore and propose the following type of partitioning
mechanism explained with example -
For example a table with a specific partitioning structure that combines a
"status" partition (active/inactive) with a date partition (business_date) for
inactive records only.
It solves my small file issue for status=active partition, where if I don't
have business date as sub partition, then I can have a few big files right
inside the status=active foloder.
1. Proposed/Expected Table Schema and Partitioning Strategy
Let's assume we have a table with columns like:
id (INT): Unique identifier
status (STRING): "active" or "inactive"
business_date (DATE): Date of the business event
data (STRING): Some data
Partitioning strategy will be:
status: Top-level partition (active/inactive)
business_date: Sub-partition only for status = 'inactive'.
Creating the Iceberg Table -
CREATE TABLE my_iceberg_table (
id INT,
status STRING,
business_date DATE,
data STRING
)
USING iceberg
PARTITIONED BY (status, CASE WHEN status = 'inactive' THEN business_date
ELSE null END);
Here -
PARTITIONED BY (status, CASE WHEN status = 'inactive' THEN business_date
ELSE null END): This is the key part.
It partitions first by status.
The CASE statement creates the sub-partition:
If status is 'inactive', it partitions by business_date.
If status is 'active', it partitions by NULL.
3. Ingesting Records
INSERT INTO my_iceberg_table VALUES
(1, 'active', '2023-10-26', 'Active data 1'),
(2, 'active', '2023-10-27', 'Active data 2'),
(3, 'inactive', '2023-10-26', 'Inactive data 1'),
(4, 'inactive', '2023-10-27', 'Inactive data 2'),
(5, 'inactive', '2023-10-27', 'Inactive data 3');
SELECT * FROM my_iceberg_table WHERE status = 'active';
SELECT * FROM my_iceberg_table WHERE status = 'inactive' AND business_date =
'2023-10-27';
### Proposal document
_No response_
### Specifications
- [x] Table
- [ ] View
- [ ] REST
- [ ] Puffin
- [ ] Encryption
- [ ] Other
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