![]() In the case of lexicographically generated files, What is Auto Loader? now leverages lexical file ordering and existing optimized APIs to make the directory listing more efficient by listing from previously-ingested files rather than by listing the entire directory. Auto Loader incremental listing support (Public Preview) This improves usability by inferring a schema that may be able to read all files even if their individual schemas differ. Setting mergeSchema to true when reading Avro files will infer a schema from a set of Avro files rather than from a single file. The Avro file format now supports the mergeSchema option when reading files. This example shows how to change the type of x to TYPE. In the fourth and fifth examples, m is a map with key and value of structure types with a field x. The second and third examples can be used if only the key type or only the value type needs to be changed. The first example changes both the key and value types of map m to KEY_TYPE and VALUE_TYPE respectively. m.value.x TYPE changes the field type of a map value.m.key.x TYPE changes the field type in a map key.m.value TYPE changes the type of map values.m.key TYPE changes the type of map keys.This example shows how to change the type of x to TYPE.Įxamples of schema hints for maps include: In the third example, arr is an array of structures with a field x. The first two examples are hints to change the type of array arr to TYPE, but they use different syntax. TYPE changes a nested field type in an array of structures.arr.element TYPE changes the array type (by using the element keyword).For structs inside of arrays, Delta MERGE INTO now resolves struct fields by name and evolves struct schemasĪuto Loader schema hints now work with array and map typesĪrray and map types are supported in Override schema inference with schema hints for Auto Loader.Įxamples of schema hints for arrays include:.Kafka Streaming Source now reports estimatedTotalBytesBehindLatest metric.CREATE FUNCTION now supports creating table functions.Auto Loader for Google Cloud now supports file notifications (Public Preview).Delta now supports arbitrary replaceWhere. ![]()
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