udf_hex_reverse
The udf_hex_reverse
function is used to reverse the order of the bytes in a hexadecimal string. This can be useful when working with data that is stored in a specific endianness and you need to convert it to another endianness.
Here's how you can use the udf_hex_reverse
function in a SQL query:
SELECT udf_hex_reverse('0000000773594000') AS reversed_hex;
In this query, we're calling the udf_hex_reverse
function with a hexadecimal string '0000000773594000'
. The function will reverse the order of the bytes in this string and return it as the result.
Example
Let's take a look at an example of how you might use the udf_hex_reverse
function:
SELECT udf_hex_reverse('0000000773594000') AS reversed_hex;
In this example, we're calling the udf_hex_reverse
function with a hexadecimal string '0000000773594000'
. The function will reverse the order of the bytes in this string and return it as the result.
SELECT
round(cast(udf_bytearray_to_bigint(udf_hex_reverse(json_value(decoded_data,'lax $.amount'))) as double)*power(0.1,9),8) as amount_raw
,json_value(decoded_data,'lax $.amount') as amount_code
,substring(json_value(decoded_data,'lax $.withdrawal_credentials'),1,4) as withdrawal_credentials_type
,udf_bytearray_to_bigint(udf_hex_reverse(json_value(decoded_data,'lax $.index'))) as deposit_index
,concat('0x',substring(json_value(decoded_data,'lax $.withdrawal_credentials'),27)) as withdrawal_address
, ROW_NUMBER() OVER (PARTITION BY transaction_hash,json_value(decoded_data,'lax $.amount') ORDER BY log_index) AS table_merging_deposits_id
from ethereum_decoded_events
where block_timestamp >= date_add('day',-7,current_date)
and contract_address = '0x00000000219ab540356cbb839cbe05303d7705fa'
and event_name = 'DepositEvent'
Conclusion
The udf_hex_reverse
function is a useful tool for reversing the order of the bytes in a hexadecimal string. It can be particularly useful when working with data that is stored in a specific endianness and you need to convert it to another endianness.
udf_hex_reverse
function is a useful tool for reversing the order of the bytes in a hexadecimal string. It can be particularly useful when working with data that is stored in a specific endianness and you need to convert it to another endianness.This tutorial provides a basic introduction to the udf_hex_reverse
function and how it can be used to reverse the order of the bytes in a hexadecimal string in SQL queries. For more advanced use cases or specific requirements, you may need to refer to the official documentation or consult with a Footprint Analytics expert.
Updated 6 months ago