Fix checkstyle

Author: cgivre

exec/java-exec/org/apache/calcite/sql2rel/SqlToRelConverter.class

@@ -17,22 +17,21 @@
  */
 package org.apache.drill.exec.planner.sql.conversion;
 
-import java.math.BigDecimal;
-import java.util.List;
-
 import org.apache.calcite.rel.type.RelDataType;
 import org.apache.calcite.rel.type.RelDataTypeFactory;
 import org.apache.calcite.rex.RexBuilder;
 import org.apache.calcite.rex.RexLiteral;
 import org.apache.calcite.rex.RexNode;
 import org.apache.calcite.sql.SqlOperator;
-import org.apache.calcite.sql.fun.SqlStdOperatorTable;
 import org.apache.calcite.sql.type.SqlTypeName;
 import org.apache.drill.common.exceptions.UserException;
 import org.apache.drill.exec.util.DecimalUtility;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.math.BigDecimal;
+import java.util.List;
+
 class DrillRexBuilder extends RexBuilder {
 
   private static final Logger logger = LoggerFactory.getLogger(DrillRexBuilder.class);

exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/conversion/DrillRexBuilder.java

@@ -19,34 +19,15 @@
 
 import org.apache.calcite.plan.RelOptCluster;
 import org.apache.calcite.plan.RelOptTable;
-import org.apache.calcite.plan.RelOptUtil;
 import org.apache.calcite.prepare.Prepare;
-import org.apache.calcite.rel.RelCollation;
-import org.apache.calcite.rel.RelCollations;
-import org.apache.calcite.rel.RelNode;
 import org.apache.calcite.rel.RelRoot;
-import org.apache.calcite.rel.hint.RelHint;
-import org.apache.calcite.rel.stream.LogicalDelta;
-import org.apache.calcite.rel.type.RelDataType;
-import org.apache.calcite.rel.type.RelDataTypeField;
-import org.apache.calcite.sql.SqlKind;
 import org.apache.calcite.sql.SqlNode;
-import org.apache.calcite.sql.SqlSelect;
-import org.apache.calcite.sql.SqlUtil;
-import org.apache.calcite.sql.type.SqlTypeName;
 import org.apache.calcite.sql.validate.SqlValidator;
 import org.apache.calcite.sql2rel.SqlRexConvertletTable;
 import org.apache.calcite.sql2rel.SqlToRelConverter;
-import org.apache.calcite.tools.RelBuilder;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.lang.reflect.Field;
-import java.lang.reflect.Method;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
-
 /**
  * Custom SqlToRelConverter for Drill that handles Calcite 1.38+ DECIMAL type checking.
  *