Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/5798#discussion_r29406841
--- Diff:
sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/HiveResolutionSuite.scala
---
@@ -81,9 +81,13 @@ class HiveResolutionSuite extends HiveComparisonTest {
.toDF().registerTempTable("caseSensitivityTest")
val query = sql("SELECT a, b, A, B, n.a, n.b, n.A, n.B FROM
caseSensitivityTest")
- assert(query.schema.fields.map(_.name) === Seq("a", "b", "A", "B",
"a", "b", "A", "B"),
+ assert(query.schema.fields.map(_.name) === Seq("a", "b", "a", "b",
"a", "b", "a", "b"),
"The output schema did not preserve the case of the query.")
--- End diff --
In Hive
```
hive> create table ddDD as select Key, valUe from src;
hive> desc extended dddd;
OK
key string
value string
Detailed Table Information Table(tableName:dddd, dbName:default,
owner:hcheng, createTime:1430368423, lastAccessTime:0, retention:0,
sd:StorageDescriptor(cols:[FieldSchema(name:key, type:string, comment:null),
FieldSchema(name:value, type:string, comment:null)],
location:file:/home/hcheng/warehouse/dddd,
inputFormat:org.apache.hadoop.mapred.TextInputFormat,
outputFormat:org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat,
compressed:false, numBuckets:-1, serdeInfo:SerDeInfo(name:null,
serializationLib:org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe,
parameters:{serialization.format=1}), bucketCols:[], sortCols:[],
parameters:{}, skewedInfo:SkewedInfo(skewedColNames:[], skewedColValues:[],
skewedColValueLocationMaps:{}), storedAsSubDirectories:false),
partitionKeys:[], parameters:{numFiles=1, COLUMN_STATS_ACCURATE=true,
transient_lastDdlTime=1430368423, numRows=0, totalSize=5824, rawDataSize=0},
viewOriginalText:null, viewExpandedText:null, tableType:MANAGED_TABLE)
Time taken: 0.111 seconds, Fetched: 4 row(s)
```
You will see both table name & column names are normalized (to lower case),
so I think it's probably not necessary for the preservation (Normalized name is
what we want, doesn't it?)
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