Github user kevin00chen commented on a diff in the pull request:
https://github.com/apache/sqoop/pull/26#discussion_r75698166
--- Diff: src/java/org/apache/sqoop/mapreduce/MergeMapperBase.java ---
@@ -76,9 +76,10 @@ protected void processRecord(SqoopRecord r, Context c)
}
Object keyObj = null;
if (keyColName.contains(",")) {
+ String connectStr = new String(new byte[]{1});
StringBuilder keyFieldsSb = new StringBuilder();
for (String str : keyColName.split(",")) {
- keyFieldsSb.append("+").append(fieldMap.get(str).toString());
+
keyFieldsSb.append(connectStr).append(fieldMap.get(str).toString());
--- End diff --
for example one table has two column, a and b
Field a | Field b
------------ | -------------
a+ | b
a | +b
when use "+" to connect two field, two record will has same keyObj.
To avoid this i use a String contains one byte.
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