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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- @nowarn() @compileTimeOnly("enable macro paradise (2.12) or -Ymacro-annotations (2.13) to expand macro annotations")
- Source
- BigQueryType.scala
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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. Fields will always appear in the generated class in the same order as they appear in the table, regardless of the order specified in selectedFields.
- 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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