fn try_base64_decode_decimal(
    str_val: &str,
    bigint_unsigned_handling: BigintUnsignedHandlingMode,
    create_error: impl Fn() -> AccessError,
) -> Result<Decimal, AccessError>Expand description
Try to decode a base64-encoded decimal string for unsigned bigint handling in Precise mode.
This is used when processing CDC data from upstream systems with unsigned bigint (e.g., MySQL CDC).
When users configure debezium.bigint.unsigned.handling.mode='precise', Debezium converts
unsigned bigint to base64-encoded decimal.