Github user harshach commented on a diff in the pull request:
https://github.com/apache/storm/pull/814#discussion_r42936898
--- Diff:
external/sql/storm-sql-core/src/jvm/org/apache/storm/sql/compiler/ExprCompiler.java
---
@@ -0,0 +1,210 @@
+/**
+ * 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.storm.sql.compiler;
+
+import com.google.common.collect.ImmutableMap;
+import org.apache.calcite.adapter.java.JavaTypeFactory;
+import org.apache.calcite.rel.type.RelDataType;
+import org.apache.calcite.rex.RexCall;
+import org.apache.calcite.rex.RexCorrelVariable;
+import org.apache.calcite.rex.RexDynamicParam;
+import org.apache.calcite.rex.RexFieldAccess;
+import org.apache.calcite.rex.RexInputRef;
+import org.apache.calcite.rex.RexLiteral;
+import org.apache.calcite.rex.RexLocalRef;
+import org.apache.calcite.rex.RexNode;
+import org.apache.calcite.rex.RexOver;
+import org.apache.calcite.rex.RexRangeRef;
+import org.apache.calcite.rex.RexVisitor;
+import org.apache.calcite.sql.SqlOperator;
+import org.apache.calcite.util.NlsString;
+import org.apache.calcite.util.Util;
+
+import java.io.PrintWriter;
+import java.lang.reflect.Type;
+import java.math.BigDecimal;
+import java.util.AbstractMap;
+import java.util.IdentityHashMap;
+import java.util.Map;
+
+import static org.apache.calcite.sql.fun.SqlStdOperatorTable.DIVIDE;
+import static
org.apache.calcite.sql.fun.SqlStdOperatorTable.DIVIDE_INTEGER;
+import static org.apache.calcite.sql.fun.SqlStdOperatorTable.GREATER_THAN;
+import static
org.apache.calcite.sql.fun.SqlStdOperatorTable.GREATER_THAN_OR_EQUAL;
+import static org.apache.calcite.sql.fun.SqlStdOperatorTable.LESS_THAN;
+import static
org.apache.calcite.sql.fun.SqlStdOperatorTable.LESS_THAN_OR_EQUAL;
+import static org.apache.calcite.sql.fun.SqlStdOperatorTable.MINUS;
+import static org.apache.calcite.sql.fun.SqlStdOperatorTable.MULTIPLY;
+import static org.apache.calcite.sql.fun.SqlStdOperatorTable.PLUS;
+
+/**
+ * Compile RexNode on top of the Tuple abstraction.
+ */
+class ExprCompiler implements RexVisitor<String> {
+ private final PrintWriter pw;
+ private final Map<RexNode, String> expr = new IdentityHashMap<>();
+ private final JavaTypeFactory typeFactory;
+ private static final ImpTable IMP_TABLE = new ImpTable();
+
+ ExprCompiler(PrintWriter pw, JavaTypeFactory typeFactory) {
+ this.pw = pw;
+ this.typeFactory = typeFactory;
+ }
+
+ @Override
+ public String visitInputRef(RexInputRef rexInputRef) {
+ if (expr.containsKey(rexInputRef)) {
+ return expr.get(rexInputRef);
+ }
+ String name = printExpr(rexInputRef, String.format("_data.get(%d)",
+ rexInputRef.getIndex()));
+ expr.put(rexInputRef, name);
+ return name;
+ }
+
+ @Override
+ public String visitLocalRef(RexLocalRef rexLocalRef) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public String visitLiteral(RexLiteral rexLiteral) {
+ Object v = rexLiteral.getValue();
+ RelDataType ty = rexLiteral.getType();
+ switch(rexLiteral.getTypeName()) {
+ case BOOLEAN:
+ return v.toString();
+ case CHAR:
+ return CompilerUtil.escapeJavaString(((NlsString) v).getValue(),
true);
+ case NULL:
+ return "null";
+ case DOUBLE:
+ case BIGINT:
+ case DECIMAL:
+ switch (ty.getSqlTypeName()) {
+ case TINYINT:
+ case SMALLINT:
+ case INTEGER:
+ return Long.toString(((BigDecimal) v).longValueExact());
+ case BIGINT:
+ return Long.toString(((BigDecimal)v).longValueExact()) + 'L';
+ case DECIMAL:
+ case FLOAT:
+ case REAL:
+ case DOUBLE:
+ return Util.toScientificNotation((BigDecimal) v);
+ }
+ break;
+ default:
+ throw new UnsupportedOperationException();
+ }
+ return null;
+ }
+
+ @Override
+ public String visitCall(RexCall rexCall) {
+ return IMP_TABLE.compile(this, rexCall);
+ }
+
+ @Override
+ public String visitOver(RexOver rexOver) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public String visitCorrelVariable(
+ RexCorrelVariable rexCorrelVariable) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public String visitDynamicParam(
+ RexDynamicParam rexDynamicParam) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public String visitRangeRef(RexRangeRef rexRangeRef) {
+ throw new UnsupportedOperationException();
+ }
+
+ @Override
+ public String visitFieldAccess(
+ RexFieldAccess rexFieldAccess) {
+ throw new UnsupportedOperationException();
+ }
+
+ private String printExpr(RexNode node, String definition) {
+ String name = "t" + expr.size();
+ Type ty = typeFactory.getJavaClass(node.getType());
+ String typeName = ((Class<?>)ty).getCanonicalName();
+ pw.append(
+ String.format("%s %s = (%s)(%s);\n", typeName, name, typeName,
definition));
+ return name;
+ }
+
+ private interface CallExprPrinter {
+ String translate(ExprCompiler compiler, RexCall call);
+ }
+
+ private static class ImpTable {
+ private final Map<SqlOperator, CallExprPrinter> translators;
+
+ private ImpTable() {
+ ImmutableMap.Builder<SqlOperator, CallExprPrinter> builder =
+ ImmutableMap.builder();
+ builder.put(infixBinary(LESS_THAN, "<"))
+ .put(infixBinary(LESS_THAN_OR_EQUAL, "<="))
+ .put(infixBinary(GREATER_THAN, ">"))
+ .put(infixBinary(GREATER_THAN_OR_EQUAL, ">="))
+ .put(infixBinary(PLUS, "+"))
+ .put(infixBinary(MINUS, "-"))
+ .put(infixBinary(MULTIPLY, "*"))
+ .put(infixBinary(DIVIDE, "/"))
+ .put(infixBinary(DIVIDE_INTEGER, "/"));
+ this.translators = builder.build();
+ }
+
+ private String compile(ExprCompiler compiler, RexCall call) {
+ SqlOperator op = call.getOperator();
+ CallExprPrinter printer = translators.get(op);
+ if (printer == null) {
+ throw new UnsupportedOperationException();
+ } else {
+ return printer.translate(compiler, call);
+ }
+ }
+ private Map.Entry<SqlOperator, CallExprPrinter> infixBinary
--- End diff --
new line here.
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