rmoff opened a new issue, #9947:
URL: https://github.com/apache/iceberg/issues/9947
### Query engine
Flink 1.18.1
Iceberg 1.5.0
### Question
I populate an Iceberg table using `CREATE …AS SELECT FROM` as a streaming
query. On disk I see datafiles written.
However, if I select from the iceberg table through Flink SQL, **nothing is
returned.**
If I then manually `INSERT` into the same table, when I query it I see the
value that I inserted, but nothing else.
Why isn't the CTAS behaving as I would expect?
## Source table (Kafka topic)
```sql
Flink SQL> CREATE TABLE t_k_test_topic (
> `msg` STRING
> ) WITH (
> 'connector' = 'kafka',
> 'topic' = 'test_topic',
> 'properties.bootstrap.servers' = 'broker:29092',
> 'scan.startup.mode' = 'earliest-offset',
> 'format' = 'raw'
> );
[INFO] Execute statement succeed.
Flink SQL> SET 'sql-client.execution.result-mode' = 'tableau';
[INFO] Execute statement succeed.
Flink SQL> SET 'execution.runtime-mode' = 'streaming';
[INFO] Execute statement succeed.
Flink SQL> SELECT * FROM t_k_test_topic;
+----+--------------------------------+
| op | msg |
+----+--------------------------------+
| +I | foobar |
| +I | foobar again |
^CQuery terminated, received a total of 2 rows
```
## Create and populate Iceberg table
```sql
Flink SQL> CREATE TABLE t_iceberg_test WITH (
> 'connector' = 'iceberg',
> 'catalog-type'='hive',
> 'catalog-name'='dev',
> 'warehouse' = 's3a://warehouse',
> 'hive-conf-dir' = './conf')
> AS
> SELECT * FROM t_k_test_topic;
[INFO] Submitting SQL update statement to the cluster...
[INFO] SQL update statement has been successfully submitted to the cluster:
Job ID: 13cebde34af11b7fe032c4059a813cbf
Flink SQL> show jobs;
+----------------------------------+-------------------------------------------------------------+----------+-------------------------+
| job id |
job name | status | start time |
+----------------------------------+-------------------------------------------------------------+----------+-------------------------+
| 13cebde34af11b7fe032c4059a813cbf |
insert-into_default_catalog.default_database.t_iceberg_test | RUNNING |
2024-03-13T12:05:25.146 |
+----------------------------------+-------------------------------------------------------------+----------+-------------------------+
1 rows in set
Flink SQL> stop job '13cebde34af11b7fe032c4059a813cbf';
[INFO] Execute statement succeed.
```
Look on disk - there are data files, with data in:
```
❯ docker exec mc bash -c \
"mc ls -r minio/warehouse/default_database.db/"
[2024-03-13 12:05:46 UTC] 438B STANDARD
t_iceberg_test/data/00000-0-20461db1-c6c4-4e88-95e2-463a354786a8-00001.parquet
[2024-03-13 12:05:24 UTC] 1.0KiB STANDARD
t_iceberg_test/metadata/00000-63f36419-05e4-4892-b55a-ce4bc2a764b0.metadata.json
```
## ❌Query the Iceberg table - it's empty
```sql
Flink SQL> SET 'execution.runtime-mode' = 'batch';
[INFO] Execute statement succeed.
Flink SQL> select * from t_iceberg_test;
Empty set
```
### But - there is data in the iceberg-generated parquet file on disk
```
❯ docker exec mc bash -c \
"mc cat
minio/warehouse/default_database.db/t_iceberg_test/data/00000-0-20461db1-c6c4-4e88-95e2-463a354786a8-00001.parquet"
> /tmp/data.parquet && \
duckdb :memory: "SELECT * FROM read_parquet('/tmp/data.parquet')"
-- Loading resources from /Users/rmoff/.duckdbrc
┌──────────────┐
│ msg │
│ varchar │
├──────────────┤
│ foobar │
│ foobar again │
└──────────────┘
```
## Manually insert a row
```sql
Flink SQL> DESCRIBE t_iceberg_test;
+------+--------+------+-----+--------+-----------+
| name | type | null | key | extras | watermark |
+------+--------+------+-----+--------+-----------+
| msg | STRING | TRUE | | | |
+------+--------+------+-----+--------+-----------+
1 row in set
Flink SQL> INSERT INTO t_iceberg_test VALUES ('snafu');
[INFO] Submitting SQL update statement to the cluster...
[INFO] SQL update statement has been successfully submitted to the cluster:
Job ID: c01c01e1f1eee815173895d7b52771c5
```
## ✅ The manually inserted row shows up as the only row in the table
```sql
Flink SQL> select * from t_iceberg_test;
+-------+
| msg |
+-------+
| snafu |
+-------+
1 row in set
```
## …but the data files on disk have three rows (two from the `CTAS`, one
from the `INSERT`)
```bash
❯ docker exec mc bash -c \
"mc ls -r minio/warehouse/default_database.db/t_iceberg_test/"
[2024-03-13 12:05:46 UTC] 438B STANDARD
data/00000-0-20461db1-c6c4-4e88-95e2-463a354786a8-00001.parquet
[2024-03-13 12:06:15 UTC] 421B STANDARD
data/00000-0-f7410475-58e7-4a50-9866-e3938096ea8d-00001.parquet
[2024-03-13 12:05:24 UTC] 1.0KiB STANDARD
metadata/00000-63f36419-05e4-4892-b55a-ce4bc2a764b0.metadata.json
[2024-03-13 12:06:15 UTC] 2.3KiB STANDARD
metadata/00001-f4e1c293-57b4-4883-897a-ff998a371449.metadata.json
[2024-03-13 12:06:15 UTC] 6.5KiB STANDARD
metadata/bb7d5d60-4e38-4cbd-bb66-b42e956e57fd-m0.avro
[2024-03-13 12:06:15 UTC] 4.1KiB STANDARD
metadata/snap-859291865824980759-1-bb7d5d60-4e38-4cbd-bb66-b42e956e57fd.avro
```
```bash
❯ docker exec mc bash -c \
"mc cat
minio/warehouse/default_database.db/t_iceberg_test/data/00000-0-f7410475-58e7-4a50-9866-e3938096ea8d-00001.parquet"
\
> /tmp/data.parquet && \
duckdb :memory: "SELECT * FROM read_parquet('/tmp/data.parquet')"
-- Loading resources from /Users/rmoff/.duckdbrc
┌─────────┐
│ msg │
│ varchar │
├─────────┤
│ snafu │
└─────────┘
❯ docker exec mc bash -c \
"mc cat
minio/warehouse/default_database.db/t_iceberg_test/data/00000-0-20461db1-c6c4-4e88-95e2-463a354786a8-00001.parquet"
> /tmp/data.parquet && \
duckdb :memory: "SELECT * FROM read_parquet('/tmp/data.parquet')"
-- Loading resources from /Users/rmoff/.duckdbrc
┌──────────────┐
│ msg │
│ varchar │
├──────────────┤
│ foobar │
│ foobar again │
└──────────────┘
```
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