[IR Compiler] fix error when creating json file (#1743)

* [IR Compiler] attach jobId to the name of each json file and write it to /tmp instead of current to have access to

* [IR Compiler] get tmp directory from system properties

research/query_service/ir/compiler/src/main/java/com/alibaba/graphscope/common/IrPlan.java

@@ -48,9 +48,12 @@
 // represent ir plan as a chain of operators
 public class IrPlan implements Closeable {
     private static IrCoreLibrary irCoreLib = IrCoreLibrary.INSTANCE;
-    private static String PLAN_JSON_FILE = "plan.json";
+    // get tmp directory from system properties, which is accessible from common users
+    private static String JSON_PLAN_DIR = System.getProperty("java.io.tmpdir");
     private Pointer ptrPlan;
     private IrMeta meta;
+    // to identify a unique json file which contains the logic plan from ir_core
+    private String planName;
 
     // call libc to transform from InterOpBase to c structure
     private enum TransformFactory implements Function<InterOpBase, Pointer> {
@@ -566,8 +569,9 @@ public Pointer createParams(QueryParams params) {
         }
     }
 
-    public IrPlan(IrMeta meta, InterOpCollection opCollection) {
+    public IrPlan(IrMeta meta, InterOpCollection opCollection, String planName) {
         this.meta = meta;
+        this.planName = planName;
         irCoreLib.setSchema(meta.getSchema());
         this.ptrPlan = irCoreLib.initLogicalPlan();
         // add snapshot to QueryParams
@@ -609,11 +613,12 @@ public byte[] toPhysicalBytes(Configs configs) throws BuildPhysicalException {
     public String getPlanAsJson() throws IOException {
         String json = "";
         if (ptrPlan != null) {
-            File file = new File(PLAN_JSON_FILE);
+            String fileName = JSON_PLAN_DIR + File.separator + planName + ".json";
+            File file = new File(fileName);
             if (file.exists()) {
                 file.delete();
             }
-            irCoreLib.writePlanToJson(ptrPlan, PLAN_JSON_FILE);
+            irCoreLib.writePlanToJson(ptrPlan, fileName);
             json = FileUtils.readFileToString(file, StandardCharsets.UTF_8);
             if (file.exists()) {
                 file.delete();

research/query_service/ir/compiler/src/main/java/com/alibaba/graphscope/gremlin/plugin/processor/IrStandardOpProcessor.java

@@ -292,15 +292,15 @@ protected void processTraversal(Traversal traversal, ResultProcessor resultProce
         // add sink operator
         InterOpCollection.process(opCollection);
 
-        IrPlan irPlan = new IrPlan(irMeta, opCollection);
+        long jobId = JOB_ID_COUNTER.incrementAndGet();
+        String jobName = "ir_plan_" + jobId;
+
+        IrPlan irPlan = new IrPlan(irMeta, opCollection, jobName);
         logger.info("{}", irPlan.getPlanAsJson());
 
         byte[] physicalPlanBytes = irPlan.toPhysicalBytes(configs);
         irPlan.close();
 
-        long jobId = JOB_ID_COUNTER.incrementAndGet();
-        String jobName = "ir_plan_" + jobId;
-
         PegasusClient.JobRequest request = PegasusClient.JobRequest.parseFrom(physicalPlanBytes);
         PegasusClient.JobConfig jobConfig =
                 PegasusClient.JobConfig.newBuilder()

research/query_service/ir/compiler/src/test/java/com/alibaba/graphscope/common/intermediate/operator/DedupOpTest.java

@@ -59,6 +59,6 @@ public static IrPlan getTestIrPlan(InterOpBase op, InterOpBase... ops) {
                 opCollection.appendInterOp(op1);
             }
         }
-        return new IrPlan(new IrMeta(""), opCollection);
+        return new IrPlan(new IrMeta(""), opCollection, "");
     }
 }