data schema_error ai_generated true

SchemaColumnConvertNotSupportedException: column type mismatch

ID: data/parquet-column-mismatch

Also available as: JSON · Markdown
80%Fix Rate
84%Confidence
3Evidence
2023-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
any active — — —

Root Cause

Parquet file schema doesnt match reader schema.

generic

Workarounds

  1. 88% success Use mergeSchema option: spark.read.option("mergeSchema","true")
  2. 90% success Align schemas before writing with explicit cast

Dead Ends

Common approaches that don't work:

  1. Force read with ignoreCorruptFiles 82% fail

    Silently drops data

  2. Rewrite all parquet files to new schema 70% fail

    Very expensive for large datasets