bowenli86 commented on a change in pull request #10249: [FLINK-14847][hive]
Support retrieving Hive PK constraints
URL: https://github.com/apache/flink/pull/10249#discussion_r354497654
##########
File path:
flink-connectors/flink-connector-hive/src/main/java/org/apache/flink/table/catalog/hive/client/HiveShimV210.java
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@@ -55,4 +60,42 @@ public void alterPartition(IMetaStoreClient client, String
databaseName, String
}
}
+ @Override
+ public UniqueConstraint getPrimaryKey(IMetaStoreClient client, String
dbName, String tableName, byte constraintTrait) {
+ try {
+ Class requestClz =
Class.forName("org.apache.hadoop.hive.metastore.api.PrimaryKeysRequest");
+ Object request =
requestClz.getDeclaredConstructor(String.class,
String.class).newInstance(dbName, tableName);
+ List<?> constraints = (List<?>)
HiveReflectionUtils.invokeMethod(client.getClass(), client,
+ "getPrimaryKeys", new
Class[]{requestClz}, new Object[]{request});
+ if (constraints.isEmpty()) {
+ return null;
+ }
+ Class constraintClz =
Class.forName("org.apache.hadoop.hive.metastore.api.SQLPrimaryKey");
+ Method colNameMethod =
constraintClz.getDeclaredMethod("getColumn_name");
+ Method isEnableMethod =
constraintClz.getDeclaredMethod("isEnable_cstr");
+ Method isValidateMethod =
constraintClz.getDeclaredMethod("isValidate_cstr");
+ Method isRelyMethod =
constraintClz.getDeclaredMethod("isRely_cstr");
+ List<String> colNames = new ArrayList<>();
+ for (Object constraint : constraints) {
+ boolean add =
!HiveTableUtil.requireEnableConstraint(constraintTrait) || (boolean)
isEnableMethod.invoke(constraint);
+ if (add) {
+ add =
!HiveTableUtil.requireValidateConstraint(constraintTrait) || (boolean)
isValidateMethod.invoke(constraint);
+ }
+ if (add) {
+ add =
!HiveTableUtil.requireRelyConstraint(constraintTrait) || (boolean)
isRelyMethod.invoke(constraint);
+ }
Review comment:
the logic here has been a bit confusing. can you add some explanation?
seems that `constaintTrait` can override `constraint`? if so, we can just
process pk based on constraintTrait first; if constraintTrait is false, then
process pk based on reflection?
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