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11-15-2024 10:24 AM
Unfortunately, there isn't a built-in Spark SQL method to directly use a schema file when creating views or tables.
You could try to create a custom SQL function that reads the schema file and returns it as a string. Then use this function in your SQL commands.
- First, create a custom UDF (User Defined Function) in Scala or Python that reads the schema file:
import org.apache.spark.sql.SparkSession import org.apache.spark.sql.functions.udf def readSchemaFile(path: String): String = { // Read the schema file and return its contents as a string scala.io.Source.fromFile(path).getLines().mkString } val spark = SparkSession.builder().getOrCreate() spark.udf.register("read_schema_file", readSchemaFile _) - Then use this function in your SQL command:
CREATE OR REPLACE VIEW entity_view AS SELECT * FROM read_files( 'dbfs:/mnt/.../entity.*json', format => 'json', schema => read_schema_file('/path/to/schema/entity.json'), rescuedDataColumn => '_rescued_data' )