[metamodel] 03/04: add class's javadoc comments so that this relationship is clear to anyone reading the code.

[ka...@apache.org]

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kaspersor pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/metamodel.git

commit 2b6238d7a371913b495acf2fa4cc0766d0d9dacd
Author: 李小保 <li...@mininglamp.com>
AuthorDate: Sun Mar 3 16:57:59 2019 +0800

    add class's javadoc comments so that this relationship is clear to anyone reading the code.
---
 .../java/org/apache/metamodel/jdbc/dialects/ImpalaQueryRewriter.java  | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/jdbc/src/main/java/org/apache/metamodel/jdbc/dialects/ImpalaQueryRewriter.java b/jdbc/src/main/java/org/apache/metamodel/jdbc/dialects/ImpalaQueryRewriter.java
index 8dc8976..90b04dc 100644
--- a/jdbc/src/main/java/org/apache/metamodel/jdbc/dialects/ImpalaQueryRewriter.java
+++ b/jdbc/src/main/java/org/apache/metamodel/jdbc/dialects/ImpalaQueryRewriter.java
@@ -22,6 +22,10 @@ import org.apache.metamodel.jdbc.JdbcDataContext;
 
 /**
  * Query rewriter for Apache Impala
+ *
+ * Because Impala uses the same metadata store as Hive to record information about table structure and properties，
+ * so Impala provides a high degree of compatibility with the Hive Query Language (HiveQL) ;
+ * @see <a href="http://impala.apache.org/docs/build/html/topics/impala_langref.html">impala.apache.org</a>
  **/
 public class ImpalaQueryRewriter extends Hive2QueryRewriter{