parisni commented on issue #7531:
URL: https://github.com/apache/hudi/issues/7531#issuecomment-1362582189
@yihua reproductible example
```
# add uuid column with comment foo bar
from pyspark.sql.types import StructType, StructField, StringType,
IntegerType
data = [
(1, "f5c2ebfd-f57b-4ff3-ac5c-f30674037b21", "A", "BC", "C"),
(2, "f5c2ebfd-f57b-4ff3-ac5c-f30674037b22", "A", "BC", "C"),
(3, "f5c2ebfd-f57b-4ff3-ac5c-f30674037b21", "A", "BC", "C"),
(4, "f5c2ebfd-f57b-4ff3-ac5c-f30674037b22", "A", "BC", "C"),
]
schema = StructType(
[
StructField("uuid", IntegerType(), True, {"comment": "foo bar"}),
StructField("user_id", StringType(), True),
StructField("col1", StringType(), True),
StructField("ts", StringType(), True),
StructField("part", StringType(), True),
]
)
df = spark.createDataFrame(data=data, schema=schema)
tableName = "test_hudi_comment"
basePath = f"/tmp/hudi/"
hudi_options = {
"hoodie.table.name": tableName,
"hoodie.datasource.write.recordkey.field": "uuid",
"hoodie.datasource.write.partitionpath.field": "part",
"hoodie.datasource.write.table.name": tableName,
"hoodie.datasource.write.operation": "insert",
"hoodie.datasource.write.precombine.field": "ts",
"hoodie.upsert.shuffle.parallelism": 1,
"hoodie.insert.shuffle.parallelism": 1,
"hoodie.datasource.hive_sync.enable": "false",
}
(df.write.format("hudi").options(**hudi_options).mode("append").save(basePath))
spark.read.format("hudi").load(basePath).registerTempTable("foo")
spark.sql("desc extended foo").show()
# there is no foo bar on the hudi side
+--------------------+---------+-------+
| col_name|data_type|comment|
+--------------------+---------+-------+
| _hoodie_commit_time| string| null|
|_hoodie_commit_seqno| string| null|
| _hoodie_record_key| string| null|
|_hoodie_partition...| string| null|
| _hoodie_file_name| string| null|
| uuid| int| null|
| user_id| string| null|
| col1| string| null|
| ts| string| null|
| part| string| null|
+--------------------+---------+-------+
# the avro has foo bar doc
"partitionToWriteStats" : {
"C" : [ {
"fileId" : "e90400c1-5311-4fdc-83f2-757326c7560d-0",
"path" :
"C/e90400c1-5311-4fdc-83f2-757326c7560d-0_0-17-36_20221222095833220.parquet",
"prevCommit" : "null",
"numWrites" : 4,
"numDeletes" : 0,
"numUpdateWrites" : 0,
"numInserts" : 4,
"totalWriteBytes" : 435614,
"totalWriteErrors" : 0,
"tempPath" : null,
"partitionPath" : "C",
"totalLogRecords" : 0,
"totalLogFilesCompacted" : 0,
"totalLogSizeCompacted" : 0,
"totalUpdatedRecordsCompacted" : 0,
"totalLogBlocks" : 0,
"totalCorruptLogBlock" : 0,
"totalRollbackBlocks" : 0,
"fileSizeInBytes" : 435614,
"minEventTime" : null,
"maxEventTime" : null
} ]
},
"compacted" : false,
"extraMetadata" : {
"schema" :
"{\"type\":\"record\",\"name\":\"test_hudi_comment_record\",\"namespace\":\"hoodie.test_hudi_comment\",\"fields\":[{\"name\":\"uuid\",\"type\":[\"null\",\"int\"],\"doc\":\"foo
bar\",\"default\":null},{\"name\":\"user_id\",\"type\":[\"null\",\"string\"],\"default\":null},{\"name\":\"col1\",\"type\":[\"null\",\"string\"],\"default\":null},{\"name\":\"ts\",\"type\":[\"null\",\"string\"],\"default\":null},{\"name\":\"part\",\"type\":[\"null\",\"string\"],\"default\":null}]}"
},
"operationType" : "INSERT"
}
```
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