[Spark] Relax type check in SchemaUtils.normalizeColumnNamesInDataType
#4143
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c27kwan
approved these changes
Feb 11, 2025
ala
changed the title
SchemaUtils. normalizeColumnNamesInDataTypeSchemaUtils.normalizeColumnNamesInDataType
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Which Delta project/connector is this regarding?
Description
This PR modifies the nested filed name normalization code. This code is used when we write to a Delta table. It makes sure that the names of all the columns in the source data (meaning, the data that we are writing to the table) match the target table column names in terms of case. For example, if the source contains column
address.CITY, while the table contains columnaddress.city, the source column is renamed to match the table.If the schema of the source data and the table data differs enough to interfere with the name normalization, we log
delta.assertions.schemaNormalization.nonNestedTypeMismatch. However, this check is too restrictive, and as a result, we log this assertion too often. This PR relaxes the check. We now assume that any two atomic columns can be matched to each other.How was this patch tested?
New tests in
SchemaUtilsSuite.Does this PR introduce any user-facing changes?
No.