Richard Chen created SPARK-36836:
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Summary: "sha2" expression with bit_length of 224 returns
incorrect results
Key: SPARK-36836
URL: https://issues.apache.org/jira/browse/SPARK-36836
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.1.0, 3.0.0, 2.4.0, 3.2.0
Reporter: Richard Chen
{{sha2(input, bit_length)}} returns incorrect results when {{bit_length ==
224}}.
This bug seems to have been present since the {{sha2}} expression was
introduced in 1.5.0.
Repro in spark shell:
{{spark.sql("SELECT sha2('abc', 224)").show()}}
Spark currently returns a garbled string, consisting of invalid UTF:
{{#\t}"4�"�B�w��U�*��你���l��}}
The expected return value is:
{{23097d223405d8228642a477bda255b32aadbce4bda0b3f7e36c9da7}}
This appears to happen because the {{MessageDigest.digest()}} function appears
to return bytes intended to be interpreted as a {{BigInt}} rather than a
string. Thus, the output of {{MessageDigest.digest()}} must first be
interpreted as a {{BigInt}} and then transformed into a hex string.
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