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Applies to: 
Databricks SQL Databricks Runtime
Returns the start offset in bytes of the block being read.
This function is not available on Unity Catalog.
In Databricks SQL AND Databricks Runtime 13.3 LTS and above this function is deprecated. Please use _metadata.file_block_start.
input_file_block_start()
This function takes no arguments.
A BIGINT.
If the information is not available -1 is returned.
The function is non-deterministic.
> SELECT input_file_block_start();
-1