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Once a cluster is deleted, below additional actions need to performed by the administrator
What is Delta?
Delta lake is
• Open source
• Builds up on standard data format
• Optimized for cloud object storage
• Built for scalable metadata handling
Delta lake is not
• Proprietary technology
• Storage format
• Storage medium
• Database service or data warehouse
You noticed a colleague is manually copying the data to the backup folder prior to running an up-date command, incase if the update command did not provide the expected outcome so he can use the backup copy to replace table, which Delta Lake feature would you recommend simplifying the process?
The answer is, Use time travel feature to refer old data instead of manually copying.
1.SELECT count(*) FROM my_table TIMESTAMP AS OF "2019-01-01"
2.SELECT count(*) FROM my_table TIMESTAMP AS OF date_sub(current_date(), 1)
3.SELECT count(*) FROM my_table TIMESTAMP AS OF "2019-01-01 01:30:00.000"
You are working on IOT data where each device has 5 reading in an array collected in Celsius, you were asked to covert each individual reading from Celsius to Fahrenheit, fill in the blank with an appropriate function that can be used in this scenario.
Schema: deviceId INT, deviceTemp ARRAY
SELECT deviceId, __(deviceTempC,i-> (i * 9/5) + 32) as deviceTempF
TRANSFORM -> Transforms elements in an array in expr using the function func.