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https://github.com/fpopic/bigquery-schema-select
(Script) Generates SQL query that selects all fields (recursively for nested fields) from the provided BigQuery schema file.
https://github.com/fpopic/bigquery-schema-select
bigquery bigquery-schema scala sql
Last synced: 27 days ago
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(Script) Generates SQL query that selects all fields (recursively for nested fields) from the provided BigQuery schema file.
- Host: GitHub
- URL: https://github.com/fpopic/bigquery-schema-select
- Owner: fpopic
- License: apache-2.0
- Created: 2020-05-23T22:00:15.000Z (over 4 years ago)
- Default Branch: master
- Last Pushed: 2024-08-31T13:26:24.000Z (2 months ago)
- Last Synced: 2024-09-29T06:21:36.359Z (about 1 month ago)
- Topics: bigquery, bigquery-schema, scala, sql
- Language: Scala
- Homepage:
- Size: 30.3 KB
- Stars: 1
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# bigquery-schema-select
[
](https://search.maven.org/#search%7Cga%7C1%7Cbigquery-schema-select_2.13)
Generates SQL query that selects all fields (recursively for nested fields) from the provided BigQuery schema file.
### Installation
Download latest version `bigquery-schema-select_2.13-X.Y.jar` from [maven releases UI](https://repo1.maven.org/maven2/com/github/fpopic/bigquery-schema-select_2.13/) or using CLI:
```shell script
# replace X.Y with the latest version
wget -O ~/bigquery-schema-select_2.13-X.Y.jar https://repo1.maven.org/maven2/com/github/fpopic/bigquery-schema-select_2.13/X.Y/bigquery-schema-select_2.13-X.Y.jar
```
### Usage
Using existing table:
```shell script
bq show --schema --format=prettyjson my_project:my_dataset.my_table | java -jar ~/bigquery-schema-select_2.13-X.Y.jar
```
Using JSON schema file:
```shell script
cat my_schema.json | java -jar ~/bigquery-schema-select_2.13-X.Y.jar
```
```json
[
{
"name": "A",
"type": "TIMESTAMP"
},
{
"name": "B",
"type": "TIMESTAMP"
},
{
"name": "C",
"type": "RECORD",
"fields": [
{
"name": "D",
"type": "RECORD",
"fields": [
{
"name": "E",
"type": "TIMESTAMP"
},
{
"name": "F",
"type": "RECORD",
"mode": "REPEATED",
"fields": [
{
"name": "G",
"type": "STRING"
}
]
}
]
},
{
"name": "H",
"type": "TIMESTAMP"
}
]
},
{
"name": "I",
"type": "RECORD",
"fields": [
{
"name": "J",
"type": "TIMESTAMP"
},
{
"name": "K",
"type": "TIMESTAMP"
}
]
},
{
"name": "L",
"type": "RECORD",
"mode": "REPEATED",
"fields": [
{
"name": "M",
"type": "TIMESTAMP"
},
{
"name": "N",
"type": "TIMESTAMP"
},
{
"name": "O",
"type": "RECORD",
"fields": [
{
"name": "P",
"type": "TIMESTAMP"
}
]
}
]
},
{
"name": "Q",
"type": "TIMESTAMP",
"mode": "REPEATED"
}
]
```
Would generate:
```sql
SELECT
A,
B,
STRUCT(
STRUCT(
C.D.E,
ARRAY(
SELECT AS STRUCT
F.G
FROM
UNNEST(C.D.F) AS F
WITH
OFFSET
ORDER BY
OFFSET
) AS F
) AS D,
C.H
) AS C,
STRUCT(
I.J,
I.K
) AS I,
ARRAY(
SELECT AS STRUCT
L.M,
L.N,
STRUCT(
L.O.P
) AS O
FROM
UNNEST(L) AS L
WITH
OFFSET
ORDER BY
OFFSET
) AS L,
Q
```
In case you would like to use snake_case for field names use flag `--use_snake_case`:
```shell script
cat my_schema.json | java -jar ~/bigquery-schema-select_2.13-X.Y.jar --use_snake_case
```