Chao Sun created SPARK-56840:
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Summary: NULLIF can fail analysis when its left operand is
unresolved
Key: SPARK-56840
URL: https://issues.apache.org/jira/browse/SPARK-56840
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 5.0.0
Reporter: Chao Sun
Spark can fail during analysis for certain NULLIF expressions when the left
operand is still unresolved, for example a nested-field reference such as
c.provider paired with another expression. The current NULLIF replacement
eagerly reads the left-side data type while constructing the null branch, which
can trip unresolved-expression access before analysis completes.
A regression test can reproduce this with a nested struct column and a
lower(...) expression on the right-hand side.
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