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Posted to commits@airflow.apache.org by "VVildVVolf (via GitHub)" <gi...@apache.org> on 2024/10/26 07:51:45 UTC
[PR] Add BigQuerySqlToGCSOperator operator [airflow]
VVildVVolf opened a new pull request, #43391:
URL: https://github.com/apache/airflow/pull/43391
This PR adds an operator for exporting from Google BigQuery's SQL result into Google Cloud Storage.
The original [BigQueryToGCSOperator](https://github.com/apache/airflow/blob/main/providers/src/airflow/providers/google/cloud/transfers/bigquery_to_gcs.py) allows only full table movement, since is based on [insert job](https://github.com/apache/airflow/blob/f80233054c204eace74d54a90e5ae517a8548922/providers/src/airflow/providers/google/cloud/hooks/bigquery.py#L1644C9-L1644C19), which has no options to pass query.
To simplify the interface of the task (switching cases of full/sql exporting modes), the SQL-based case of BQ->GCS job is implemented as a separate one.
The exporting format might be different for BQ for different cases, so the `field_to_bigquery` and `convert_type` methods are implemented as easy overridable. The default output format is made to manual saving of BQ's result as local file.
For example, for the query:
```sql
SELECT
True as _BOOL,
CODE_POINTS_TO_BYTES([65, 98, 67, 100]) as _BYTES,
DATE('0001-01-01') as _DATE,
DATETIME('0001-01-01 00:00:00') as _DATETIME,
JSON '{"id": 10,"type": "fruit","name": "apple","on_menu": true,"recipes":{"salads":[{ "id": 2001, "type": "Walnut Apple Salad" },{ "id": 2002, "type": "Apple Spinach Salad" }],"desserts":[{ "id": 3001, "type": "Apple Pie" },{ "id": 3002, "type": "Apple Scones" },{ "id": 3003, "type": "Apple Crumble" }]}}' as _JSON,
-9223372036854775808 as _INT64,
cast(-9.9999999999999999999999999999999999999E+28 as NUMERIC) as _NUMERIC,
cast(-5.7896044618658097711785492504343953926634992332820282019728792003956564819968E+38 as BIGNUMERIC) as _BIGNUMERIC,
1.0 as _FLOAT64,
"str" as _STRING,
TIME '12:30:00.45' as _TIME,
TIMESTAMP '2014-09-27 12:30:00.45-08' as _TIMESTAMP
```
The `BigQueryToGCSOperator` output (exported as a table):
```
_BOOL,_BYTES,_DATE,_DATETIME,_JSON,_INT64,_NUMERIC,_BIGNUMERIC,_FLOAT64,_STRING,_TIME,_TIMESTAMP
true,QWJDZA==,0001-01-01,0001-01-01 00:00:00,"{""id"":10,""name"":""apple"",""on_menu"":true,""recipes"":{""desserts"":[{""id"":3001,""type"":""Apple Pie""},{""id"":3002,""type"":""Apple Scones""},{""id"":3003,""type"":""Apple Crumble""}],""salads"":[{""id"":2001,""type"":""Walnut Apple Salad""},{""id"":2002,""type"":""Apple Spinach Salad""}]},""type"":""fruit""}",-9223372036854775808,-99999999999999999999999999999.999999999,-578960446186580977117854925043439539266.34992332820282019728792003956564819968,1,str,12:30:00.450,2014-09-27 20:30:00.45 UTC
```
The cloud console's saving to file result (exported as query result):
```
_BOOL,_BYTES,_DATE,_DATETIME,_JSON,_INT64,_NUMERIC,_BIGNUMERIC,_FLOAT64,_STRING,_TIME,_TIMESTAMP
true,QWJDZA==,0001-01-01,0001-01-01T00:00:00,"{""id"":10,""name"":""apple"",""on_menu"":true,""recipes"":{""desserts"":[{""id"":3001,""type"":""Apple Pie""},{""id"":3002,""type"":""Apple Scones""},{""id"":3003,""type"":""Apple Crumble""}],""salads"":[{""id"":2001,""type"":""Walnut Apple Salad""},{""id"":2002,""type"":""Apple Spinach Salad""}]},""type"":""fruit""}",-9223372036854775808,-99999999999999999999999999999.999999999,-578960446186580977117854925043439539266.34992332820282019728792003956564819968,1.0,str,12:30:00.450000,2014-09-27 20:30:00.450000 UTC
```
The result of new `BigQuerySqlToGCSOperator` (with default `field_to_bigquery` and `convert_type` methods) is:
```
_BOOL,_BYTES,_DATE,_DATETIME,_JSON,_INT64,_NUMERIC,_BIGNUMERIC,_FLOAT64,_STRING,_TIME,_TIMESTAMP
true,QWJDZA==,0001-01-01,0001-01-01T00:00:00,"{""id"":10,""name"":""apple"",""on_menu"":true,""recipes"":{""desserts"":[{""id"":3001,""type"":""Apple Pie""},{""id"":3002,""type"":""Apple Scones""},{""id"":3003,""type"":""Apple Crumble""}],""salads"":[{""id"":2001,""type"":""Walnut Apple Salad""},{""id"":2002,""type"":""Apple Spinach Salad""}]},""type"":""fruit""}",-9223372036854775808,-99999999999999999999999999999.999999999,-578960446186580977117854925043439539266.34992332820282019728792003956564819968,1.0,str,12:30:00.450000,2014-09-27 20:30:00.450000 UTC
```
Since usage of `schema` is property simplifies formatting of the output data, but might be defined only at the moment of query execution - this property behaves overridable also, to let user decide if it is ok or not to change the property's value on a fly.
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Re: [PR] Add BigQuerySqlToGCSOperator operator [airflow]
Posted by "VVildVVolf (via GitHub)" <gi...@apache.org>.
VVildVVolf commented on PR #43391:
URL: https://github.com/apache/airflow/pull/43391#issuecomment-2439799932
Thanks @raphaelauv for pointing. It might be not so flexible, but majority of cases should cover.
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Re: [PR] Add BigQuerySqlToGCSOperator operator [airflow]
Posted by "raphaelauv (via GitHub)" <gi...@apache.org>.
raphaelauv commented on PR #43391:
URL: https://github.com/apache/airflow/pull/43391#issuecomment-2439748416
why don't you use the `BigQueryInsertJobOperator` and a SQL query of type `EXPORT DATA` ?
https://cloud.google.com/bigquery/docs/exporting-data#sql
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Re: [PR] Add BigQuerySqlToGCSOperator operator [airflow]
Posted by "VVildVVolf (via GitHub)" <gi...@apache.org>.
VVildVVolf closed pull request #43391: Add BigQuerySqlToGCSOperator operator
URL: https://github.com/apache/airflow/pull/43391
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