[feature][headless]Introduce TranslatorConfig to make result limit configurable via system parameter.

headless/core/src/main/java/com/tencent/supersonic/headless/core/translator/TranslatorConfig.java

@@ -0,0 +1,24 @@
+package com.tencent.supersonic.headless.core.translator;
+
+import com.google.common.collect.Lists;
+import com.tencent.supersonic.common.config.ParameterConfig;
+import com.tencent.supersonic.common.pojo.Parameter;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service("HeadlessTranslatorConfig")
+@Slf4j
+public class TranslatorConfig extends ParameterConfig {
+
+    public static final Parameter TRANSLATOR_RESULT_LIMIT =
+            new Parameter("s2.query-optimizer.resultLimit", "1000", "查询最大返回数据行数",
+                    "为了前端展示性能考虑，请不要设置过大", "number", "语义翻译配置");
+
+    @Override
+    public List<Parameter> getSysParameters() {
+        return Lists.newArrayList(TRANSLATOR_RESULT_LIMIT);
+    }
+
+}

headless/core/src/main/java/com/tencent/supersonic/headless/core/translator/optimizer/ResultLimitOptimizer.java

@@ -16,6 +16,6 @@ public class ResultLimitOptimizer implements QueryOptimizer {
 
     @Override
     public void rewrite(QueryStatement queryStatement) {
-        queryStatement.setSql(queryStatement.getSql() + " limit " + queryStatement.getLimit());
+        queryStatement.setSql(queryStatement.getSql() + " LIMIT " + queryStatement.getLimit());
     }
 }