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From sudheeshkatkam <...@git.apache.org>
Subject [GitHub] drill pull request: Drill 4372 review
Date Thu, 03 Mar 2016 18:25:23 GMT
Github user sudheeshkatkam commented on a diff in the pull request:

    https://github.com/apache/drill/pull/397#discussion_r54923299
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/TypeInferenceUtils.java
---
    @@ -0,0 +1,568 @@
    +/**
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + *
    + * http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +package org.apache.drill.exec.planner.sql;
    +
    +import com.google.common.collect.ImmutableMap;
    +import com.google.common.collect.Lists;
    +
    +import com.google.common.collect.Maps;
    +import org.apache.calcite.avatica.util.TimeUnit;
    +import org.apache.calcite.rel.type.RelDataType;
    +import org.apache.calcite.rel.type.RelDataTypeFactory;
    +import org.apache.calcite.sql.SqlCallBinding;
    +import org.apache.calcite.sql.SqlCharStringLiteral;
    +import org.apache.calcite.sql.SqlDynamicParam;
    +import org.apache.calcite.sql.SqlLiteral;
    +import org.apache.calcite.sql.SqlNode;
    +import org.apache.calcite.sql.SqlOperatorBinding;
    +import org.apache.calcite.sql.type.SqlReturnTypeInference;
    +import org.apache.calcite.sql.type.SqlTypeName;
    +
    +import org.apache.drill.common.expression.ExpressionPosition;
    +import org.apache.drill.common.expression.FunctionCall;
    +import org.apache.drill.common.expression.LogicalExpression;
    +import org.apache.drill.common.expression.MajorTypeInLogicalExpression;
    +import org.apache.drill.common.exceptions.UserException;
    +import org.apache.drill.common.types.TypeProtos;
    +import org.apache.drill.common.types.Types;
    +import org.apache.drill.exec.expr.TypeHelper;
    +import org.apache.drill.exec.expr.fn.DrillFuncHolder;
    +import org.apache.drill.exec.planner.logical.DrillConstExecutor;
    +import org.apache.drill.exec.resolver.FunctionResolver;
    +import org.apache.drill.exec.resolver.FunctionResolverFactory;
    +import org.apache.drill.exec.resolver.TypeCastRules;
    +
    +import java.util.List;
    +import java.util.Map;
    +
    +public class TypeInferenceUtils {
    +  private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(TypeInferenceUtils.class);
    +
    +  public static final TypeProtos.MajorType UNKNOWN_TYPE = TypeProtos.MajorType.getDefaultInstance();
    +  private static ImmutableMap<TypeProtos.MinorType, SqlTypeName> DRILL_TO_CALCITE_TYPE_MAPPING
=
    +      ImmutableMap.<TypeProtos.MinorType, SqlTypeName> builder()
    +          .put(TypeProtos.MinorType.INT, SqlTypeName.INTEGER)
    +          .put(TypeProtos.MinorType.BIGINT, SqlTypeName.BIGINT)
    +          .put(TypeProtos.MinorType.FLOAT4, SqlTypeName.FLOAT)
    +          .put(TypeProtos.MinorType.FLOAT8, SqlTypeName.DOUBLE)
    +          .put(TypeProtos.MinorType.VARCHAR, SqlTypeName.VARCHAR)
    +          .put(TypeProtos.MinorType.BIT, SqlTypeName.BOOLEAN)
    +          .put(TypeProtos.MinorType.DATE, SqlTypeName.DATE)
    +          .put(TypeProtos.MinorType.DECIMAL9, SqlTypeName.DECIMAL)
    +          .put(TypeProtos.MinorType.DECIMAL18, SqlTypeName.DECIMAL)
    +          .put(TypeProtos.MinorType.DECIMAL28SPARSE, SqlTypeName.DECIMAL)
    +          .put(TypeProtos.MinorType.DECIMAL38SPARSE, SqlTypeName.DECIMAL)
    +          .put(TypeProtos.MinorType.TIME, SqlTypeName.TIME)
    +          .put(TypeProtos.MinorType.TIMESTAMP, SqlTypeName.TIMESTAMP)
    +          .put(TypeProtos.MinorType.VARBINARY, SqlTypeName.VARBINARY)
    +          .put(TypeProtos.MinorType.INTERVALYEAR, SqlTypeName.INTERVAL_YEAR_MONTH)
    +          .put(TypeProtos.MinorType.INTERVALDAY, SqlTypeName.INTERVAL_DAY_TIME)
    +          .put(TypeProtos.MinorType.MAP, SqlTypeName.MAP)
    +          .put(TypeProtos.MinorType.LIST, SqlTypeName.ARRAY)
    +          .put(TypeProtos.MinorType.LATE, SqlTypeName.ANY)
    +          .build();
    +
    +  private static ImmutableMap<SqlTypeName, TypeProtos.MinorType> CALCITE_TO_DRILL_MAPPING
=
    +      ImmutableMap.<SqlTypeName, TypeProtos.MinorType> builder()
    +          .put(SqlTypeName.INTEGER, TypeProtos.MinorType.INT)
    +          .put(SqlTypeName.BIGINT, TypeProtos.MinorType.BIGINT)
    +          .put(SqlTypeName.FLOAT, TypeProtos.MinorType.FLOAT4)
    +          .put(SqlTypeName.DOUBLE, TypeProtos.MinorType.FLOAT8)
    +          .put(SqlTypeName.VARCHAR, TypeProtos.MinorType.VARCHAR)
    +          .put(SqlTypeName.BOOLEAN, TypeProtos.MinorType.BIT)
    +          .put(SqlTypeName.DATE, TypeProtos.MinorType.DATE)
    +          .put(SqlTypeName.TIME, TypeProtos.MinorType.TIME)
    +          .put(SqlTypeName.TIMESTAMP, TypeProtos.MinorType.TIMESTAMP)
    +          .put(SqlTypeName.VARBINARY, TypeProtos.MinorType.VARBINARY)
    +          .put(SqlTypeName.INTERVAL_YEAR_MONTH, TypeProtos.MinorType.INTERVALYEAR)
    +          .put(SqlTypeName.INTERVAL_DAY_TIME, TypeProtos.MinorType.INTERVALDAY)
    +          .put(SqlTypeName.CHAR, TypeProtos.MinorType.VARCHAR)
    +          .put(SqlTypeName.DECIMAL, TypeProtos.MinorType.FLOAT8)
    +          .build();
    +
    +  private static Map<String, SqlReturnTypeInference> funcNameToInference = Maps.newHashMap();
    +  static {
    +    funcNameToInference.put("DATE_PART", DrillDatePartSqlReturnTypeInference.INSTANCE);
    +    funcNameToInference.put("SUM", DrillSumSqlReturnTypeInference.INSTANCE);
    +    funcNameToInference.put("COUNT", DrillCountSqlReturnTypeInference.INSTANCE);
    +    funcNameToInference.put("CONCAT", DrillConcatSqlReturnTypeInference.INSTANCE);
    +    funcNameToInference.put("LENGTH", DrillLengthSqlReturnTypeInference.INSTANCE);
    +    funcNameToInference.put("LPAD", DrillPadTrimSqlReturnTypeInference.INSTANCE);
    +    funcNameToInference.put("RPAD", DrillPadTrimSqlReturnTypeInference.INSTANCE);
    +    funcNameToInference.put("LTRIM", DrillPadTrimSqlReturnTypeInference.INSTANCE);
    +    funcNameToInference.put("RTRIM", DrillPadTrimSqlReturnTypeInference.INSTANCE);
    +    funcNameToInference.put("BTRIM", DrillPadTrimSqlReturnTypeInference.INSTANCE);
    +    funcNameToInference.put("TRIM", DrillPadTrimSqlReturnTypeInference.INSTANCE);
    +    funcNameToInference.put("CONVERT_TO", DrillConvertToSqlReturnTypeInference.INSTANCE);
    +    funcNameToInference.put("EXTRACT", DrillExtractSqlReturnTypeInference.INSTANCE);
    +    funcNameToInference.put("SQRT", DrillSqrtSqlReturnTypeInference.INSTANCE);
    +    funcNameToInference.put("CAST", DrillCastSqlReturnTypeInference.INSTANCE);
    +    funcNameToInference.put("FLATTEN", DrillDeferToExecSqlReturnTypeInference.INSTANCE);
    +    funcNameToInference.put("KVGEN", DrillDeferToExecSqlReturnTypeInference.INSTANCE);
    +    funcNameToInference.put("CONVERT_FROM", DrillDeferToExecSqlReturnTypeInference.INSTANCE);
    +  }
    +
    +  /**
    +   * Given a Drill's TypeProtos.MinorType, return a Calcite's corresponding SqlTypeName
    +   */
    +  public static SqlTypeName getCalciteTypeFromDrillType(final TypeProtos.MinorType type)
{
    +    return DRILL_TO_CALCITE_TYPE_MAPPING.get(type);
    +  }
    +
    +  /**
    +   * Given a Calcite's RelDataType, return a Drill's corresponding TypeProtos.MinorType
    +   */
    +  public static TypeProtos.MinorType getDrillTypeFromCalciteType(final RelDataType relDataType)
{
    +    final SqlTypeName sqlTypeName = relDataType.getSqlTypeName();
    +    TypeProtos.MinorType minorType = CALCITE_TO_DRILL_MAPPING.get(sqlTypeName);
    +    if(minorType == null) {
    +      minorType = TypeProtos.MinorType.LATE;
    +    }
    +    return minorType;
    +  }
    +
    +  /**
    +   * Give the name and DrillFuncHolder list, return the inference mechanism.
    +   */
    +  public static SqlReturnTypeInference getDrillSqlReturnTypeInference(
    +      final String name,
    +      final List<DrillFuncHolder> functions) {
    +
    +    final String nameCap = name.toUpperCase();
    +    if(funcNameToInference.containsKey(nameCap)) {
    +      return funcNameToInference.get(nameCap);
    +    } else {
    +      return new DrillDefaultSqlReturnTypeInference(functions);
    +    }
    +  }
    +
    +  private static class DrillDefaultSqlReturnTypeInference implements SqlReturnTypeInference
{
    +    private final List<DrillFuncHolder> functions;
    +
    +    public DrillDefaultSqlReturnTypeInference(List<DrillFuncHolder> functions)
{
    +      this.functions = functions;
    +    }
    +
    +    @Override
    +    public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
    +      final RelDataTypeFactory factory = opBinding.getTypeFactory();
    +      if (functions.isEmpty()) {
    +        return factory.createTypeWithNullability(
    +            factory.createSqlType(SqlTypeName.ANY),
    +            true);
    +      }
    +
    +      // This code for boolean output type is added for addressing DRILL-1729
    +      // In summary, if we have a boolean output function in the WHERE-CLAUSE,
    +      // this logic can validate and execute user queries seamlessly
    +      boolean allBooleanOutput = true;
    +      for (DrillFuncHolder function : functions) {
    +        if (function.getReturnType().getMinorType() != TypeProtos.MinorType.BIT) {
    +          allBooleanOutput = false;
    +          break;
    +        }
    +      }
    +      if (allBooleanOutput) {
    +        return factory.createTypeWithNullability(
    +            factory.createSqlType(SqlTypeName.BOOLEAN), true);
    +      }
    +
    +      // The following logic is just a safe play:
    +      // Even if any of the input arguments has ANY type,
    +      // it "might" still be possible to determine the return type based on other non-ANY
types
    +      for (RelDataType type : opBinding.collectOperandTypes()) {
    +        if (type.getSqlTypeName() == SqlTypeName.ANY) {
    +          return factory.createTypeWithNullability(
    +              factory.createSqlType(SqlTypeName.ANY),
    +              true);
    +        }
    +      }
    +
    +      final DrillFuncHolder func = resolveDrillFuncHolder(opBinding, functions);
    +      final RelDataType returnType = getReturnType(opBinding, func);
    +      return returnType;
    +    }
    +
    +    private static RelDataType getReturnType(final SqlOperatorBinding opBinding, final
DrillFuncHolder func) {
    +      final RelDataTypeFactory factory = opBinding.getTypeFactory();
    +
    +      // least restrictive type (nullable ANY type)
    +      final RelDataType nullableAnyType = factory.createTypeWithNullability(
    +          factory.createSqlType(SqlTypeName.ANY),
    +          true);
    +
    +      final TypeProtos.MajorType returnType = func.getReturnType();
    +      if (UNKNOWN_TYPE.equals(returnType)) {
    +        return nullableAnyType;
    +      }
    +
    +      final TypeProtos.MinorType minorType = returnType.getMinorType();
    +      final SqlTypeName sqlTypeName = getCalciteTypeFromDrillType(minorType);
    +      if (sqlTypeName == null) {
    +        return nullableAnyType;
    +      }
    +
    +      final boolean isNullable;
    +      switch (returnType.getMode()) {
    +        case REPEATED:
    +        case OPTIONAL:
    +          isNullable = true;
    +          break;
    +
    +        case REQUIRED:
    +          switch (func.getNullHandling()) {
    +            case INTERNAL:
    +              isNullable = false;
    +              break;
    +
    +            case NULL_IF_NULL:
    +              boolean isNull = false;
    +              for (int i = 0; i < opBinding.getOperandCount(); ++i) {
    +                if (opBinding.getOperandType(i).isNullable()) {
    +                  isNull = true;
    +                  break;
    +                }
    +              }
    +
    +              isNullable = isNull;
    +              break;
    +            default:
    +              throw new UnsupportedOperationException();
    +          }
    +          break;
    +
    +        default:
    +          throw new UnsupportedOperationException();
    +      }
    +
    +      return DrillConstExecutor.createCalciteTypeWithNullability(
    +          factory,
    +          sqlTypeName,
    +          isNullable);
    +    }
    +  }
    +
    +  private static class DrillDeferToExecSqlReturnTypeInference implements SqlReturnTypeInference
{
    +    private static DrillDeferToExecSqlReturnTypeInference INSTANCE = new DrillDeferToExecSqlReturnTypeInference();
    +
    +    @Override
    +    public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
    +      final RelDataTypeFactory factory = opBinding.getTypeFactory();
    +      return factory.createTypeWithNullability(
    +          factory.createSqlType(SqlTypeName.ANY),
    +          true);
    +    }
    +  }
    +
    +  private static class DrillSumSqlReturnTypeInference implements SqlReturnTypeInference
{
    +    private static DrillSumSqlReturnTypeInference INSTANCE = new DrillSumSqlReturnTypeInference();
    +
    +    @Override
    +    public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
    +      final RelDataTypeFactory factory = opBinding.getTypeFactory();
    +      // If there is group-by and the imput type is Non-nullable,
    +      // the output is Non-nullable;
    +      // Otherwise, the output is nullable.
    +      final boolean isNullable = opBinding.getGroupCount() == 0
    +          || opBinding.getOperandType(0).isNullable();
    +
    +      final SqlTypeName sqlTypeName = opBinding.getOperandType(0).getSqlTypeName();
    +      if(sqlTypeName == SqlTypeName.ANY) {
    +        return DrillConstExecutor.createCalciteTypeWithNullability(
    +            factory,
    +            SqlTypeName.ANY,
    +            isNullable);
    +      }
    +
    +      final TypeProtos.MinorType inputMinorType = getDrillTypeFromCalciteType(opBinding.getOperandType(0));
    +      if(TypeCastRules.getLeastRestrictiveType(Lists.newArrayList(inputMinorType, TypeProtos.MinorType.BIGINT))
    +          == TypeProtos.MinorType.BIGINT) {
    +        return DrillConstExecutor.createCalciteTypeWithNullability(
    +            factory,
    +            SqlTypeName.BIGINT,
    +            isNullable);
    +      } else if(TypeCastRules.getLeastRestrictiveType(Lists.newArrayList(inputMinorType,
TypeProtos.MinorType.FLOAT8))
    +          == TypeProtos.MinorType.FLOAT8) {
    +        return DrillConstExecutor.createCalciteTypeWithNullability(
    +            factory,
    +            SqlTypeName.DOUBLE,
    +            isNullable);
    +      } else {
    +        throw UserException
    +            .functionError()
    +            .message(String.format("%s does not support operand types (%s)",
    +                opBinding.getOperator().getName(),
    +                sqlTypeName))
    +            .build(logger);
    +      }
    +    }
    +  }
    +
    +  private static class DrillCountSqlReturnTypeInference implements SqlReturnTypeInference
{
    +    private static DrillCountSqlReturnTypeInference INSTANCE = new DrillCountSqlReturnTypeInference();
    +
    +    @Override
    +    public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
    +      final RelDataTypeFactory factory = opBinding.getTypeFactory();
    +      final SqlTypeName type = SqlTypeName.BIGINT;
    +      return DrillConstExecutor.createCalciteTypeWithNullability(
    +          factory,
    +          type,
    +          false);
    +    }
    +  }
    +
    +  private static class DrillConcatSqlReturnTypeInference implements SqlReturnTypeInference
{
    +    private static DrillConcatSqlReturnTypeInference INSTANCE = new DrillConcatSqlReturnTypeInference();
    +
    +    @Override
    +    public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
    +      final RelDataTypeFactory factory = opBinding.getTypeFactory();
    +
    +      boolean isNullable = true;
    +      int precision = 0;
    +      for(RelDataType relDataType : opBinding.collectOperandTypes()) {
    +        if(!relDataType.isNullable()) {
    +          isNullable = false;
    +        }
    +
    +        // If the underlying columns cannot offer information regarding the precision
(i.e., the length) of the VarChar,
    +        // Drill uses the largest to represent it
    +        if(relDataType.getPrecision() == TypeHelper.VARCHAR_DEFAULT_CAST_LEN
    +            || relDataType.getPrecision() == RelDataType.PRECISION_NOT_SPECIFIED) {
    +          precision = TypeHelper.VARCHAR_DEFAULT_CAST_LEN;
    +        } else {
    +          precision += relDataType.getPrecision();
    +        }
    +      }
    +
    +      return factory.createTypeWithNullability(
    +          factory.createSqlType(SqlTypeName.VARCHAR, precision),
    +          isNullable);
    +    }
    +  }
    +
    +  private static class DrillLengthSqlReturnTypeInference implements SqlReturnTypeInference
{
    +    private static DrillLengthSqlReturnTypeInference INSTANCE = new DrillLengthSqlReturnTypeInference();
    +
    +    @Override
    +    public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
    +      final RelDataTypeFactory factory = opBinding.getTypeFactory();
    +      final SqlTypeName sqlTypeName = SqlTypeName.BIGINT;
    +
    +      // We need to check only the first argument because
    +      // the second one is used to represent encoding type
    +      final boolean isNullable = opBinding.getOperandType(0).isNullable();
    +      return DrillConstExecutor.createCalciteTypeWithNullability(
    +          factory,
    +          sqlTypeName,
    +          isNullable);
    +    }
    +  }
    +
    +  private static class DrillPadTrimSqlReturnTypeInference implements SqlReturnTypeInference
{
    +    private static DrillPadTrimSqlReturnTypeInference INSTANCE = new DrillPadTrimSqlReturnTypeInference();
    +
    +    @Override
    +    public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
    +      final RelDataTypeFactory factory = opBinding.getTypeFactory();
    +      final SqlTypeName sqlTypeName = SqlTypeName.VARCHAR;
    +
    +      for(int i = 0; i < opBinding.getOperandCount(); ++i) {
    +        if(opBinding.getOperandType(i).isNullable()) {
    +          return DrillConstExecutor.createCalciteTypeWithNullability(
    +              factory, sqlTypeName, true);
    +        }
    +      }
    +
    +      return DrillConstExecutor.createCalciteTypeWithNullability(
    +          factory, sqlTypeName, false);
    +    }
    +  }
    +
    +  private static class DrillConvertToSqlReturnTypeInference implements SqlReturnTypeInference
{
    +    private static DrillConvertToSqlReturnTypeInference INSTANCE = new DrillConvertToSqlReturnTypeInference();
    +
    +    @Override
    +    public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
    +      final RelDataTypeFactory factory = opBinding.getTypeFactory();
    +      final SqlTypeName type = SqlTypeName.VARBINARY;
    +
    +      return DrillConstExecutor.createCalciteTypeWithNullability(
    +          factory, type, opBinding.getOperandType(0).isNullable());
    +    }
    +  }
    +
    +  private static class DrillExtractSqlReturnTypeInference implements SqlReturnTypeInference
{
    +    private static DrillExtractSqlReturnTypeInference INSTANCE = new DrillExtractSqlReturnTypeInference();
    +
    +    @Override
    +    public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
    +      final RelDataTypeFactory factory = opBinding.getTypeFactory();
    +      final TimeUnit timeUnit = opBinding.getOperandType(0).getIntervalQualifier().getStartUnit();
    +      final boolean isNullable = opBinding.getOperandType(1).isNullable();
    +
    +      final SqlTypeName sqlTypeName = getSqlTypeNameForTimeUnit(timeUnit.name());
    +      return DrillConstExecutor.createCalciteTypeWithNullability(
    +          factory,
    +          sqlTypeName,
    +          isNullable);
    +    }
    +  }
    +
    +  private static class DrillSqrtSqlReturnTypeInference implements SqlReturnTypeInference
{
    +    private static DrillSqrtSqlReturnTypeInference INSTANCE = new DrillSqrtSqlReturnTypeInference();
    +
    +    @Override
    +    public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
    +      final RelDataTypeFactory factory = opBinding.getTypeFactory();
    +      final boolean isNullable = opBinding.getOperandType(0).isNullable();
    +      return DrillConstExecutor.createCalciteTypeWithNullability(
    +          factory,
    +          SqlTypeName.DOUBLE,
    +          isNullable);
    +    }
    +  }
    +
    +  private static class DrillDatePartSqlReturnTypeInference implements SqlReturnTypeInference
{
    +    private static DrillDatePartSqlReturnTypeInference INSTANCE = new DrillDatePartSqlReturnTypeInference();
    +
    +    @Override
    +    public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
    +      final RelDataTypeFactory factory = opBinding.getTypeFactory();
    +
    +      final SqlNode firstOperand = ((SqlCallBinding) opBinding).operand(0);
    +      if(!(firstOperand instanceof SqlCharStringLiteral)) {
    +        return DrillConstExecutor.createCalciteTypeWithNullability(factory,
    +            SqlTypeName.ANY,
    +            opBinding.getOperandType(1).isNullable());
    +      }
    +
    +      final String part = ((SqlCharStringLiteral) firstOperand)
    +          .getNlsString()
    +          .getValue()
    +          .toUpperCase();
    +
    +      final SqlTypeName sqlTypeName = getSqlTypeNameForTimeUnit(part);
    +      final boolean isNullable = opBinding.getOperandType(1).isNullable();
    +      return DrillConstExecutor.createCalciteTypeWithNullability(
    +          factory,
    +          sqlTypeName,
    +          isNullable);
    +    }
    +  }
    +
    +  private static class DrillCastSqlReturnTypeInference implements SqlReturnTypeInference
{
    +    private static DrillCastSqlReturnTypeInference INSTANCE = new DrillCastSqlReturnTypeInference();
    +
    +    @Override
    +    public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
    +      final RelDataTypeFactory factory = opBinding.getTypeFactory();
    +      final boolean isNullable = opBinding
    +          .getOperandType(0)
    +          .isNullable();
    +
    +      RelDataType ret = factory.createTypeWithNullability(
    +          opBinding.getOperandType(1),
    +          isNullable);
    +
    +      if (opBinding instanceof SqlCallBinding) {
    +        SqlCallBinding callBinding = (SqlCallBinding) opBinding;
    +        SqlNode operand0 = callBinding.operand(0);
    +
    +        // dynamic parameters and null constants need their types assigned
    +        // to them using the type they are casted to.
    +        if (((operand0 instanceof SqlLiteral)
    +                && (((SqlLiteral) operand0).getValue() == null))
    +                || (operand0 instanceof SqlDynamicParam)) {
    +          callBinding.getValidator().setValidatedNodeType(
    +                  operand0,
    +                  ret);
    +        }
    +      }
    +
    +      return ret;
    +    }
    +  }
    +
    +  private static DrillFuncHolder resolveDrillFuncHolder(final SqlOperatorBinding opBinding,
final List<DrillFuncHolder> functions) {
    +    final List<LogicalExpression> args = Lists.newArrayList();
    +    for (final RelDataType type : opBinding.collectOperandTypes()) {
    +      final TypeProtos.MinorType minorType = getDrillTypeFromCalciteType(type);
    +      final TypeProtos.MajorType majorType;
    +      if (type.isNullable()) {
    +        majorType =  Types.optional(minorType);
    +      } else {
    +        majorType = Types.required(minorType);
    +      }
    +
    +      args.add(new MajorTypeInLogicalExpression(majorType));
    +    }
    +    final FunctionCall functionCall = new FunctionCall(opBinding.getOperator().getName(),
args, ExpressionPosition.UNKNOWN);
    +    final FunctionResolver functionResolver = FunctionResolverFactory.getResolver();
    +    final DrillFuncHolder func = functionResolver.getBestMatch(functions, functionCall);
    +
    +    // Throw an exception
    +    // if no DrillFuncHolder matched for the given list of operand types
    +    if(func == null) {
    +      String operandTypes = "";
    +      for(int i = 0; i < opBinding.getOperandCount(); ++i) {
    +        operandTypes += opBinding.getOperandType(i).getSqlTypeName();
    +        if(i < opBinding.getOperandCount() - 1) {
    +          operandTypes += ",";
    +        }
    +      }
    +
    +      throw UserException
    +          .functionError()
    +          .message(String.format("%s does not support operand types (%s)",
    +              opBinding.getOperator().getName(),
    +              operandTypes))
    +          .build(logger);
    +    }
    +    return func;
    +  }
    +
    +  /**
    +   * This class is not intended to be initiated
    --- End diff --
    
    instantiated


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