com.alpine.plugin.core.spark.utils
SparkSchemaUtils
Related Docs:
trait SparkSchemaUtils
| package utils
com.alpine.plugin.core.spark.utils
Convert from Alpine's 'ColumnType' to the corresponding Spark Sql Typ.
Convert from Alpine's 'ColumnType' to the corresponding Spark Sql Typ. DateTime Behavior: Converts all DateTime columns to TimeStampType. If there is a format string will add that to the metadata. If there is no format string, will use the ISO format ("yyyy-mm-dd hh:mm:ss")
Converts from a Spark SQL Structfield to an Alpine-specific ColumnDef.
Converts from a Spark SQL Structfield to an Alpine-specific ColumnDef.
Converts from a Spark SQL schema to the Alpine 'TabularSchema' type.
Converts from a Spark SQL schema to the Alpine 'TabularSchema' type. The 'TabularSchema' object this method returns can be used to create any of the tabular Alpine IO types (HDFSTabular dataset, dataTable etc.)
Date format behavior: If the column def has not metadata stored at the DATE_METADATA_KEY constant, it wll convert DateType objects to ColumnType(DateTime, "yyyy-mm-dd") and TimeStampType objects to ColumnType(DateTime, "yyyy-mm-dd hh:mm:ss") otherwise will create a column type of ColumnType(DateTime, custom_date_format) where custom_date_format is whatever date format was specified by the column metadata.
-a Spark SQL DataFrame schema
the equivalent Alpine schema for that dataset
Convert the Alpine 'TabularSchema' with column names and types to the equivalent Spark SQL data frame header.
Convert the Alpine 'TabularSchema' with column names and types to the equivalent Spark SQL data frame header.
Date/Time behavior: The same as convertTabularSchemaToSparkSQLSchema(tabularSchema, false). Will NOT convert special date formats to String. Instead will render Alpine date formats as Spark SQL TimeStampType. The original date format will be stored as metadata in the StructFiled object for that column definition.
An Alpine 'TabularSchemaOutline' object with fixed column definitions containing a name and Alpine specific type.
Will not properly handle data formats. Use toStructField
Converts from a Spark SQL data type to an Alpine-specific ColumnType
Converts from a Spark SQL data type to an Alpine-specific ColumnType
This doesn't properly handle date formats. Use convertSparkSQLDataTypeToColumnType instead