[feat][runtime] Pushing down instr function to store.

Author: nokiaMS

coding/src/main/java/io/dingodb/expr/coding/FunIndex.java

@@ -34,6 +34,7 @@
 import io.dingodb.expr.runtime.op.mathematical.TanFunFactory;
 import io.dingodb.expr.runtime.op.mathematical.TanhFunFactory;
 import io.dingodb.expr.runtime.op.string.ConcatFun;
+import io.dingodb.expr.runtime.op.string.InstrFun;
 import io.dingodb.expr.runtime.op.string.LTrim1FunFactory;
 import io.dingodb.expr.runtime.op.string.LeftFunFactory;
 import io.dingodb.expr.runtime.op.string.LowerFunFactory;
@@ -142,6 +143,9 @@ static int getBinary(@NonNull BinaryOp op) {
             case Mid2FunFactory.NAME:
                 funIndex = 0x2F;
                 break;
+            case InstrFun.NAME:
+                funIndex = 0x30;
+                break;
             default:
                 break;
         }

libexpr

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2021 DataCanvas
+ *
+ * Licensed 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 io.dingodb.expr.runtime.op.string;
+
+import io.dingodb.expr.runtime.ExprConfig;
+import io.dingodb.expr.runtime.op.BinaryOp;
+import org.checkerframework.checker.nullness.qual.NonNull;
+
+public class InstrFun extends BinaryOp {
+    private static final long serialVersionUID = -200033123590846940L;
+
+    public static final InstrFun INSTANCE = new InstrFun();
+
+    public static final String NAME = "instr";
+
+    @Override
+    public Object evalValue(Object value0, Object value1, ExprConfig config) {
+        if (value0 == null || value1 == null) {
+            return null;
+        }
+        String str = value0.toString();
+        String point = value1.toString();
+        return str.indexOf(point) + 1;
+    }
+
+    @Override
+    public @NonNull String getName() {
+        return NAME;
+    }
+}