[IOTDB-5919]show variables add a variable timestamp_precision (#9936)

Author: l2280212

confignode/src/main/java/org/apache/iotdb/confignode/manager/ConfigManager.java

@@ -480,6 +480,7 @@ public TClusterParameters getClusterParameters() {
     clusterParameters.setSchemaRegionPerDataNode(CONF.getSchemaRegionPerDataNode());
     clusterParameters.setDiskSpaceWarningThreshold(COMMON_CONF.getDiskSpaceWarningThreshold());
     clusterParameters.setReadConsistencyLevel(CONF.getReadConsistencyLevel());
+    clusterParameters.setTimestampPrecision(COMMON_CONF.getTimestampPrecision());
     return clusterParameters;
   }
 

node-commons/src/main/java/org/apache/iotdb/commons/conf/CommonConfig.java

@@ -128,6 +128,8 @@ public class CommonConfig {
   /** Ip and port of target ML node. */
   private TEndPoint targetMLNodeEndPoint = new TEndPoint("127.0.0.1", 10810);
 
+  private String timestampPrecision = "ms";
+
   CommonConfig() {}
 
   public void updatePath(String homeDir) {
@@ -376,4 +378,12 @@ public boolean isStopping() {
   public void setStopping(boolean stopping) {
     isStopping = stopping;
   }
+
+  public void setTimestampPrecision(String timestampPrecision) {
+    this.timestampPrecision = timestampPrecision;
+  }
+
+  public String getTimestampPrecision() {
+    return timestampPrecision;
+  }
 }

node-commons/src/main/java/org/apache/iotdb/commons/conf/CommonDescriptor.java

@@ -188,6 +188,9 @@ public void loadCommonProps(Properties properties) {
                     String.valueOf(config.getDiskSpaceWarningThreshold()))
                 .trim()));
 
+    config.setTimestampPrecision(
+        properties.getProperty("timestamp_precision", config.getTimestampPrecision()).trim());
+
     String endPointUrl =
         properties.getProperty(
             "target_ml_node_endpoint",

server/src/main/java/org/apache/iotdb/db/mpp/common/header/ColumnHeaderConstant.java

@@ -119,6 +119,8 @@ public class ColumnHeaderConstant {
   public static final String READ_CONSISTENCY_LEVEL = "ReadConsistencyLevel";
   public static final String DISK_SPACE_WARNING_THRESHOLD = "DiskSpaceWarningThreshold";
 
+  public static final String TIMESTAMP_PRECISION = "TimestampPrecision";
+
   // column names for show region statement
   public static final String REGION_ID = "RegionId";
   public static final String TYPE = "Type";

server/src/main/java/org/apache/iotdb/db/mpp/plan/execution/config/metadata/ShowVariablesTask.java

@@ -117,6 +117,10 @@ public static void buildTSBlock(
         builder,
         new Binary(ColumnHeaderConstant.DISK_SPACE_WARNING_THRESHOLD),
         new Binary(String.valueOf(clusterParameters.getDiskSpaceWarningThreshold())));
+    buildTSBlock(
+        builder,
+        new Binary(ColumnHeaderConstant.TIMESTAMP_PRECISION),
+        new Binary(String.valueOf(clusterParameters.getTimestampPrecision())));
 
     DatasetHeader datasetHeader = DatasetHeaderFactory.getShowClusterParametersHeader();
     future.set(new ConfigTaskResult(TSStatusCode.SUCCESS_STATUS, builder.build(), datasetHeader));

thrift-confignode/src/main/thrift/confignode.thrift

@@ -352,6 +352,7 @@ struct TClusterParameters {
   12: required i32 seriesPartitionSlotNum
   13: required string seriesPartitionExecutorClass
   14: required double diskSpaceWarningThreshold
+  15: required string timestampPrecision
 }
 
 struct TConfigNodeRegisterReq {