Github user sudheeshkatkam commented on a diff in the pull request:
https://github.com/apache/drill/pull/397#discussion_r54924830
--- 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(
--- End diff --
Move createCalciteTypeWithNullability to this class.
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