bigquery-schema-select
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 or using CLI:
# 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.jarUsage
Using existing table:
bq show --schema --format=prettyjson my_project:my_dataset.my_table | java -jar ~/bigquery-schema-select_2.13-X.Y.jarUsing JSON schema file:
cat my_schema.json | java -jar ~/bigquery-schema-select_2.13-X.Y.jar[
{
"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:
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,
QIn case you would like to use snake_case for field names use flag --use_snake_case:
cat my_schema.json | java -jar ~/bigquery-schema-select_2.13-X.Y.jar --use_snake_case
