How to update a value in a column in a delta table with Map of Struct datatype?

Mado — Fri, 19 Jan 2024 01:30:02 GMT

I have a delta table in Databricks named "prod.silver.control_table". It has a few columns including "table_name" with string data type and "transform_options" with the below structure:

 |-- transform_options: map (nullable = true)
 |    |-- key: string
 |    |-- value: struct (valueContainsNull = true)
 |    |    |-- col_name_mappings: map (nullable = true)
 |    |    |    |-- key: string
 |    |    |    |-- value: string (valueContainsNull = true)
 |    |    |-- type_mappings: map (nullable = true)
 |    |    |    |-- key: string
 |    |    |    |-- value: string (valueContainsNull = true)
 |    |    |-- partition_duplicates_by: array (nullable = true)
 |    |    |    |-- element: string (containsNull = true)
 |    |    |-- order_duplicates_by: array (nullable = true)
 |    |    |    |-- element: string (containsNull = true)

For example, when "table_name" is "prod.silver.weather", the "transform_options" is:

{
"prod.bronze.weather_source_a":{"col_name_mappings":{"col_a_old":"col_a_new","col_b_old":"col_b_new"},"type_mappings":{"col_a_new":"INT","col_b_new":"TIMESTAMP"},"partition_duplicates_by":["col_a_new"],"order_duplicates_by":["_commit_version"]},
"prod.bronze.weather_source_b":{"col_name_mappings":{"col_c_old":"col_c_new","col_d_old":"col_d_new"},"type_mappings":{"col_c_new":"INT","col_d_new":"TIMESTAMP"},"partition_duplicates_by":["col_c_new"],"order_duplicates_by":["ingestion_timestamp","_commit_version"]}
}

I need to update values in "order_duplicates_by". I need to change "_commit_version" into "commit_version" by removing the initial underscore.

Any idea how to update table values?

Re: How to update a value in a column in a delta table with Map of Struct datatype?

Mado — Sun, 21 Jan 2024 06:06:44 GMT

@Retired_mod

Could you give me more hints on how to use UPDATE command for this specific case?

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How to update a value in a column in a delta table with Map of Struct datatype?

Re: How to update a value in a column in a delta table with Map of Struct datatype?