ihuzenko commented on a change in pull request #1940: DRILL-7406: Update 
Calcite to 1.21.0
URL: https://github.com/apache/drill/pull/1940#discussion_r362041807
 
 

 ##########
 File path: 
exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/handlers/ShowTablesHandler.java
 ##########
 @@ -37,17 +32,19 @@
 import org.apache.calcite.tools.RelConversionException;
 import org.apache.calcite.tools.ValidationException;
 import org.apache.calcite.util.NlsString;
-import org.apache.calcite.util.Pair;
 import org.apache.calcite.util.Util;
 import org.apache.drill.common.exceptions.UserException;
 import org.apache.drill.exec.planner.sql.SchemaUtilites;
-import org.apache.drill.exec.planner.sql.SqlConverter;
 import org.apache.drill.exec.planner.sql.parser.DrillParserUtil;
 import org.apache.drill.exec.planner.sql.parser.SqlShowTables;
 import org.apache.drill.exec.store.AbstractSchema;
 import org.apache.drill.exec.store.ischema.InfoSchemaTableType;
 import org.apache.drill.exec.work.foreman.ForemanSetupException;
 
+import static 
org.apache.drill.exec.store.ischema.InfoSchemaConstants.IS_SCHEMA_NAME;
+import static 
org.apache.drill.exec.store.ischema.InfoSchemaConstants.SHRD_COL_TABLE_NAME;
+import static 
org.apache.drill.exec.store.ischema.InfoSchemaConstants.SHRD_COL_TABLE_SCHEMA;
 
 Review comment:
   This is part of ```InfoSchemaConstants``` interface for constants. I guess 
that there are some implicit conventions and changing this thee names will 
require renaming of all others. @arina-ielchiieva could you please confirm that 
such renaming makes sense?

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