Created
May 8, 2019 03:59
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| // Databricks notebook source | |
| // MAGIC %fs | |
| // MAGIC rm -r dbfs:/delta/poc/events | |
| // COMMAND ---------- | |
| case class Data(a:Int,b:String) | |
| val first = Seq(Data(1,"a")).toDF | |
| // COMMAND ---------- | |
| first.write.format("delta").mode("overwrite").save("/delta/poc/events") | |
| // COMMAND ---------- | |
| // MAGIC %sql | |
| // MAGIC DROP TABLE IF EXISTS poc_events | |
| // COMMAND ---------- | |
| // MAGIC %sql | |
| // MAGIC CREATE TABLE poc_events ( | |
| // MAGIC a INTEGER, | |
| // MAGIC b STRING) | |
| // MAGIC USING DELTA | |
| // MAGIC LOCATION '/delta/poc/events' | |
| // COMMAND ---------- | |
| spark.table("poc_events") | |
| // COMMAND ---------- | |
| spark.sql("SELECT max(version) FROM (DESCRIBE HISTORY delta.`/delta/poc/events`)").collect() | |
| // COMMAND ---------- | |
| // MAGIC %sql | |
| // MAGIC SELECT * FROM poc_events@v0 | |
| // COMMAND ---------- | |
| // append same data | |
| first.write.format("delta").mode("append").save("/delta/poc/events") | |
| // COMMAND ---------- | |
| // MAGIC %sql | |
| // MAGIC SELECT * FROM poc_events@v0 | |
| // COMMAND ---------- | |
| spark.sql("SELECT max(version) FROM (DESCRIBE HISTORY delta.`/delta/poc/events`)").collect() | |
| // COMMAND ---------- | |
| // MAGIC %sql | |
| // MAGIC SELECT * FROM poc_events@v1 | |
| // COMMAND ---------- | |
| val mergeValue = Seq(Data(1,"b")).toDF | |
| mergeValue.createOrReplaceTempView("merge") | |
| // COMMAND ---------- | |
| // MAGIC %sql | |
| // MAGIC MERGE INTO poc_events target | |
| // MAGIC USING merge source | |
| // MAGIC ON source.a = target.a | |
| // MAGIC WHEN MATCHED THEN UPDATE SET * | |
| // COMMAND ---------- | |
| // MAGIC %sql | |
| // MAGIC select * from poc_events | |
| // COMMAND ---------- | |
| spark.table("poc_events") | |
| // COMMAND ---------- | |
| // MAGIC %sql | |
| // MAGIC SELECT * FROM poc_events@v0 | |
| // COMMAND ---------- | |
| // MAGIC %sql | |
| // MAGIC SELECT * FROM poc_events@v1 | |
| // COMMAND ---------- | |
| // MAGIC %sql | |
| // MAGIC SELECT * FROM poc_events@v2 | |
| // COMMAND ---------- | |
Author
smdmts
commented
May 8, 2019
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