jcamachor commented on a change in pull request #696: HIVE-18842
URL: https://github.com/apache/hive/pull/696#discussion_r300229497
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File path: ql/src/java/org/apache/hadoop/hive/ql/exec/Utilities.java
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@@ -4587,4 +4594,20 @@ private static void tryToLogClassPath(String prefix,
ClassLoader loader, Logger
loader == null ? "null" : loader.getClass().getSimpleName());
}
}
+
+ public static String encodeColumnNames(List<String> colNames) throws
SemanticException {
+ try {
+ return JSON_MAPPER.writeValueAsString(colNames);
+ } catch (IOException e) {
+ throw new SemanticException(e);
+ }
+ }
+
+ public static List<String> decodeColumnNames(String colNamesStr) throws
SemanticException {
+ try {
+ return JSON_MAPPER.readValue(colNamesStr, List.class);
Review comment:
JSON_MAPPER is just a Jackson `ObjectMapper` object that can be used to
convert JSON into objects and vice versa. In particular, `colNamesStr` here is
the JSON value (in String form) and we pass the `List.class` because we want to
generate an instance of that object.
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