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To display the structure of a parquet file, including the data type of each column, you can use the printSchema() method in Apache Spark. Here's an example:
val df = spark.read.parquet("path/to/parquet/file")
df.printSchema()
Alternatively, you can use the parquet-tools command-line tool to display the schema of a parquet file. Here's an example:
parquet-tools schema path/to/parquet/file
This will output the schema of the parquet file in JSON format.