arina-ielchiieva commented on a change in pull request #1846: DRILL-7356:
Introduce session options for the Drill Metastore
URL: https://github.com/apache/drill/pull/1846#discussion_r316769216
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/ExecConstants.java
##########
@@ -1044,4 +1044,67 @@ public static String bootDefaultFor(String name) {
public static final RangeLongValidator QUERY_MAX_ROWS_VALIDATOR = new
RangeLongValidator(QUERY_MAX_ROWS, 0, Integer.MAX_VALUE,
new OptionDescription("The maximum number of rows that the query will
return. This can be only set at a SYSTEM level by an admin. (Drill 1.16+)"));
+ /**
+ * Option that enables Drill metastore usage.
+ */
+ public static final String METASTORE_ENABLED = "metastore.enabled";
+ public static final BooleanValidator METASTORE_ENABLED_VALIDATOR = new
BooleanValidator(METASTORE_ENABLED,
+ new OptionDescription("Enables Drill metastore usage to be able to store
table metadata " +
+ "during ANALYZE TABLE commands execution and to be able to read
table metadata during regular " +
+ "queries execution or when querying some INFORMATION_SCHEMA tables.
" +
+ "This option is not active for now. Default is false. (Drill
1.17+)"));
+
+ /**
+ * Option for specifying maximum level depth for collecting metadata
+ * which will be stored in the Drill metastore. For example, when {@code
FILE} value
+ * is set, {@code ROW_GROUP} level metadata wouldn't be collected and stored
into the metastore.
+ */
+ public static final String METASTORE_METADATA_STORE_DEPTH_LEVEL =
"metastore.metadata.store.depth_level";
+ public static final EnumeratedStringValidator
METASTORE_METADATA_STORE_DEPTH_LEVEL_VALIDATOR = new
EnumeratedStringValidator(METASTORE_METADATA_STORE_DEPTH_LEVEL,
+ new OptionDescription("Specifies maximum level depth for collecting
metadata. " +
+ "This option is not active for now. Default is 'ROW_GROUP'. (Drill
1.17+)"),
+ "TABLE", "SEGMENT", "PARTITION", "FILE", "ROW_GROUP");
+
+ /**
+ * Option for enabling usage of the schema stored to the metastore.
+ */
+ public static final String METASTORE_USE_SCHEMA_METADATA =
"metastore.metadata.use_schema";
+ public static final BooleanValidator METASTORE_USE_SCHEMA_METADATA_VALIDATOR
= new BooleanValidator(METASTORE_USE_SCHEMA_METADATA,
+ new OptionDescription("Enables usage of the schema stored to the
metastore. " +
+ "This option is not active for now. Default is false. (Drill
1.17+)"));
+
+ /**
+ * Option for enabling usage of the statistics stored to the metastore at
the planning stage.
+ */
+ public static final String METASTORE_USE_STATISTICS_METADATA =
"metastore.metadata.use_statistics";
+ public static final BooleanValidator
METASTORE_USE_STATISTICS_METADATA_VALIDATOR = new
BooleanValidator(METASTORE_USE_STATISTICS_METADATA,
+ new OptionDescription("Enables usage of the statistics stored to the
metastore at the planning stage. " +
+ "This option is not active for now. Default is false. (Drill
1.17+)"));
+
+ /**
+ * Option for collecting schema and / or column statistics for every table
after CTAS and CTTAS execution.
+ */
+ public static final String METASTORE_CTAS_AUTO_COLLECT_METADATA =
"metastore.metadata.ctas.auto-collect";
+ public static final EnumeratedStringValidator
METASTORE_CTAS_AUTO_COLLECT_METADATA_VALIDATOR = new
EnumeratedStringValidator(METASTORE_CTAS_AUTO_COLLECT_METADATA,
+ new OptionDescription("Specifies whether schema and / or column
statistics will be " +
+ "automatically collected for every table after CTAS and CTTAS. " +
+ "This option is not active for now. Default is 'NONE'. (Drill
1.17+)"),
+ "NONE", "ALL", "SCHEMA");
+
+ /**
+ * Option for allowing using file metadata cache if required metadata is
absent in the metastore.
+ */
+ public static final String METASTORE_FALLBACK_TO_FILE_METADATA =
"metastore.metadata.fallback_to_file_metadata";
+ public static final BooleanValidator
METASTORE_FALLBACK_TO_FILE_METADATA_VALIDATOR = new
BooleanValidator(METASTORE_FALLBACK_TO_FILE_METADATA,
+ new OptionDescription("Allows using file metadata cache for the case
when required metadata is absent in the metastore. " +
Review comment:
```suggestion
new OptionDescription("Allows using file metadata cache for the case
when required metadata is absent in the Metastore. " +
```
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