macro class fromStorage extends Annotation with StaticAnnotation
Macro annotation for a BigQuery table using the storage API.
Generate case classes for BigQuery storage API, including column projection and filtering.
Note that tableSpec must be a string literal in the form of project:dataset.table with
optional .stripMargin at the end. For example:
@BigQueryType.fromStorage("project:dataset.table") class MyRecord
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Instance Constructors
- new fromStorage(tableSpec: String, args: List[Any] = Nil, selectedFields: List[String] = Nil, rowRestriction: String = "")
- selectedFields
names of the fields in the table that should be read. If empty, all fields will be read. If the specified field is a nested field, all the sub-fields in the field will be selected.
- rowRestriction
SQL text filtering statement, similar ti a WHERE clause in a query. Currently, we support combinations of predicates that are a comparison between a column and a constant value in SQL statement. Aggregates are not supported. For example:
"a > DATE '2014-09-27' AND (b > 5 AND c LIKE 'date')"String formatting syntax can be used in
tableSpecwhen additionalargsare supplied. For example:@BigQueryType.fromStorage("project:dataset.%s", "table")
"$LATEST" can be used as a placeholder for table partitions. The latest partition available will be used. For example:
@BigQueryType.fromStorage("project:dataset.table_%s", "$LATEST")
Also generate a companion object with convenience methods.
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