Github user hsuanyi commented on a diff in the pull request:
https://github.com/apache/drill/pull/461#discussion_r58758011
--- Diff:
contrib/storage-hive/core/src/main/java/org/apache/drill/exec/store/hive/schema/HiveDatabaseSchema.java
---
@@ -72,4 +80,76 @@ public String getTypeName() {
return HiveStoragePluginConfig.NAME;
}
+ @Override
+ public List<Pair<String, ? extends Table>> getTablesByNames(final
List<String> tableNames) {
+ final String schemaName = getName();
+ final List<Pair<String, ? extends Table>> tableNameToTable =
Lists.newArrayList();
+ List<org.apache.hadoop.hive.metastore.api.Table> tables;
+ // Retries once if the first call to fetch the metadata fails
+ synchronized(mClient) {
+ final List<String> tableNamesWithAuth = Lists.newArrayList();
+ for(String tableName : tableNames) {
+ try {
+ if(mClient.tableExists(schemaName, tableName)) {
--- End diff --
There are two parts which makes the query slow.
One follows from your point; The other is fetching partitions which turned
out not used. [1]
[1]
https://github.com/apache/drill/blob/245da9790813569c5da9404e0fc5e45cc88e22bb/contrib/storage-hive/core/src/main/java/org/apache/drill/exec/store/hive/DrillHiveMetaStoreClient.java#L236
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