CREATE TABLE LIKE Command¶
Delta Lake supports creating an empty new delta table using CREATE TABLE LIKE DDL statement based on the definition and metadata of an existing table or view.
Delta Lake resolves CREATE TABLE LIKEs with a delta source table or USING delta (case-insensitive) to a CreateDeltaTableCommand using DeltaAnalysis logical resolution rule.
CREATE TABLE LIKE Feature for Delta #1584
Demo¶
Create Delta Table¶
spark.range(5)
.withColumn("my_lit", lit(5))
.writeTo("source_delta")
.using("delta")
.create
Create Like Using Delta¶
sql("""
CREATE TABLE target_like_delta
LIKE source_delta
USING delta
""").show(false)
sql("""
DESC EXTENDED target_like_delta
""").show(false)
+----------------------------+------------------------------------------------------------------------------------+-------+
|col_name |data_type |comment|
+----------------------------+------------------------------------------------------------------------------------+-------+
|id |bigint | |
|my_lit |int | |
| | | |
|# Partitioning | | |
|Not partitioned | | |
| | | |
|# Detailed Table Information| | |
|Name |default.target_like_delta | |
|Location |file:/Users/jacek/dev/apps/spark-3.3.2-bin-hadoop3/spark-warehouse/target_like_delta| |
|Provider |delta | |
|Owner |jacek | |
|Table Properties |[delta.minReaderVersion=1,delta.minWriterVersion=2] | |
+----------------------------+------------------------------------------------------------------------------------+-------+
Create Like¶
sql("""
CREATE TABLE target_like_delta_no_using
LIKE source_delta
""").show(false)
sql("""
DESC HISTORY target_like_delta_no_using
""").show(false)
+-------+-----------------------+------+--------+------------+-----------------------------------------------------------------------------+----+--------+---------+-----------+--------------+-------------+----------------+------------+-----------------------------------+
|version|timestamp |userId|userName|operation |operationParameters |job |notebook|clusterId|readVersion|isolationLevel|isBlindAppend|operationMetrics|userMetadata|engineInfo |
+-------+-----------------------+------+--------+------------+-----------------------------------------------------------------------------+----+--------+---------+-----------+--------------+-------------+----------------+------------+-----------------------------------+
|0 |2023-04-07 20:13:17.669|null |null |CREATE TABLE|{isManaged -> true, description -> null, partitionBy -> [], properties -> {}}|null|null |null |null |Serializable |true |{} |null |Apache-Spark/3.3.2 Delta-Lake/2.3.0|
+-------+-----------------------+------+--------+------------+-----------------------------------------------------------------------------+----+--------+---------+-----------+--------------+-------------+----------------+------------+-----------------------------------+