[feat](nereids) implement showConvertLscCommand in nereids

fe/fe-core/src/main/antlr4/org/apache/doris/nereids/DorisParser.g4

@@ -283,6 +283,7 @@ supportedShowStatement
         (LIKE STRING_LITERAL)?                                                      #showTableCreation
     | SHOW TABLET STORAGE FORMAT VERBOSE?                                           #showTabletStorageFormat
     | SHOW QUERY PROFILE queryIdPath=STRING_LITERAL                                 #showQueryProfile
+    | SHOW CONVERT_LSC ((FROM | IN) database=multipartIdentifier)?                  #showConvertLsc
     ;
 
 supportedLoadStatement
@@ -374,7 +375,6 @@ unsupportedShowStatement
     | SHOW BUILD INDEX ((FROM | IN) database=multipartIdentifier)?
         wildWhere? sortClause? limitClause?                                         #showBuildIndex
     | SHOW (CLUSTERS | (COMPUTE GROUPS))                                            #showClusters
-    | SHOW CONVERT_LSC ((FROM | IN) database=multipartIdentifier)?                  #showConvertLsc
     | SHOW REPLICA STATUS FROM baseTableRef wildWhere?                              #showReplicaStatus
     | SHOW COPY ((FROM | IN) database=multipartIdentifier)?
         whereClause? sortClause? limitClause?                                       #showCopy

fe/fe-core/src/main/java/org/apache/doris/nereids/parser/LogicalPlanBuilder.java

@@ -248,6 +248,7 @@
 import org.apache.doris.nereids.DorisParser.ShowCollationContext;
 import org.apache.doris.nereids.DorisParser.ShowConfigContext;
 import org.apache.doris.nereids.DorisParser.ShowConstraintContext;
+import org.apache.doris.nereids.DorisParser.ShowConvertLscContext;
 import org.apache.doris.nereids.DorisParser.ShowCreateCatalogContext;
 import org.apache.doris.nereids.DorisParser.ShowCreateDatabaseContext;
 import org.apache.doris.nereids.DorisParser.ShowCreateMTMVContext;
@@ -569,6 +570,7 @@
 import org.apache.doris.nereids.trees.plans.commands.ShowCollationCommand;
 import org.apache.doris.nereids.trees.plans.commands.ShowConfigCommand;
 import org.apache.doris.nereids.trees.plans.commands.ShowConstraintsCommand;
+import org.apache.doris.nereids.trees.plans.commands.ShowConvertLSCCommand;
 import org.apache.doris.nereids.trees.plans.commands.ShowCreateCatalogCommand;
 import org.apache.doris.nereids.trees.plans.commands.ShowCreateDatabaseCommand;
 import org.apache.doris.nereids.trees.plans.commands.ShowCreateMTMVCommand;
@@ -5195,5 +5197,11 @@ public LogicalPlan visitUseDatabase(UseDatabaseContext ctx) {
         return ctx.catalog != null ? new UseCommand(ctx.catalog.getText(), ctx.database.getText())
                 : new UseCommand(ctx.database.getText());
     }
+
+    @Override
+    public LogicalPlan visitShowConvertLsc(ShowConvertLscContext ctx) {
+        MultipartIdentifierContext database = ctx.database;
+        return database == null ? new ShowConvertLSCCommand(null) : new ShowConvertLSCCommand(database.getText());
+    }
 }
 

fe/fe-core/src/main/java/org/apache/doris/nereids/trees/plans/PlanType.java

@@ -252,6 +252,7 @@ public enum PlanType {
     SHOW_WARNING_ERRORS_COMMAND,
     SHOW_WHITE_LIST_COMMAND,
     SHOW_TABLETS_BELONG_COMMAND,
+    SHOW_CONVERT_LSC_COMMAND,
     SYNC_COMMAND,
     RECOVER_DATABASE_COMMAND,
     RECOVER_TABLE_COMMAND,

fe/fe-core/src/main/java/org/apache/doris/nereids/trees/plans/commands/ShowConvertLSCCommand.java

@@ -0,0 +1,117 @@
+// 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.doris.nereids.trees.plans.commands;
+
+import org.apache.doris.analysis.RedirectStatus;
+import org.apache.doris.catalog.Column;
+import org.apache.doris.catalog.ColumnIdFlushDaemon;
+import org.apache.doris.catalog.ColumnIdFlushDaemon.FlushStatus;
+import org.apache.doris.catalog.Env;
+import org.apache.doris.catalog.ScalarType;
+import org.apache.doris.common.ErrorCode;
+import org.apache.doris.common.ErrorReport;
+import org.apache.doris.mysql.privilege.PrivPredicate;
+import org.apache.doris.nereids.trees.plans.PlanType;
+import org.apache.doris.nereids.trees.plans.visitor.PlanVisitor;
+import org.apache.doris.qe.ConnectContext;
+import org.apache.doris.qe.ShowResultSet;
+import org.apache.doris.qe.ShowResultSetMetaData;
+import org.apache.doris.qe.StmtExecutor;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Represents the command for SHOW CONVERT LIGHT SCHEMA CHANGE PROCESS .
+ */
+public class ShowConvertLSCCommand extends ShowCommand {
+
+    private static final int COLUMN_LENGTH = 30;
+    private final String dbName;
+
+    public ShowConvertLSCCommand(String dbName) {
+        super(PlanType.SHOW_CONVERT_LSC_COMMAND);
+        this.dbName = dbName;
+    }
+
+    @Override
+    public ShowResultSet doRun(ConnectContext ctx, StmtExecutor executor) throws Exception {
+        // Check if the user has ADMIN or OPERATOR privileges
+        if (!Env.getCurrentEnv().getAccessManager().checkGlobalPriv(ConnectContext.get(), PrivPredicate.ADMIN)
+                && !Env.getCurrentEnv().getAccessManager().checkGlobalPriv(ConnectContext.get(),
+                PrivPredicate.OPERATOR)) {
+            ErrorReport.reportAnalysisException(ErrorCode.ERR_SPECIFIC_ACCESS_DENIED_ERROR, "ADMIN/OPERATOR");
+        }
+        return handleShowConvertLSC();
+    }
+
+    @Override
+    public <R, C> R accept(PlanVisitor<R, C> visitor, C context) {
+        return visitor.visitShowConvertLscCommand(this, context);
+    }
+
+    /**
+     * get show result set metadata.
+     */
+    public ShowResultSetMetaData getMetaData() {
+        ShowResultSetMetaData.Builder builder = ShowResultSetMetaData.builder();
+        Column databaseColumn = new Column("database", ScalarType.createVarcharType(COLUMN_LENGTH));
+        Column tableNameColumn = new Column("table", ScalarType.createVarcharType(COLUMN_LENGTH));
+        Column statusColumn = new Column("status", ScalarType.createVarcharType(COLUMN_LENGTH));
+        builder.addColumn(databaseColumn);
+        builder.addColumn(tableNameColumn);
+        builder.addColumn(statusColumn);
+        return builder.build();
+    }
+
+    private ShowResultSet handleShowConvertLSC() {
+        ColumnIdFlushDaemon columnIdFlusher = Env.getCurrentEnv().getColumnIdFlusher();
+        columnIdFlusher.readLock();
+        List<List<String>> rows;
+        try {
+            Map<String, Map<String, FlushStatus>> resultCollector =
+                    columnIdFlusher.getResultCollector();
+            rows = new ArrayList<>();
+            if (dbName != null) {
+                Map<String, ColumnIdFlushDaemon.FlushStatus> tblNameToStatus = resultCollector.get(dbName);
+                if (tblNameToStatus != null) {
+                    tblNameToStatus.forEach((tblName, status) -> {
+                        List<String> row = Arrays.asList(dbName, tblName, status.getMsg());
+                        rows.add(row);
+                    });
+                }
+            } else {
+                resultCollector.forEach((dbName, tblNameToStatus) ->
+                        tblNameToStatus.forEach((tblName, status) -> {
+                            List<String> row = Arrays.asList(dbName, tblName, status.getMsg());
+                            rows.add(row);
+                        }));
+            }
+        } finally {
+            columnIdFlusher.readUnlock();
+        }
+        return new ShowResultSet(getMetaData(), rows);
+    }
+
+    @Override
+    public RedirectStatus toRedirectStatus() {
+        return RedirectStatus.FORWARD_NO_SYNC;
+    }
+}

fe/fe-core/src/main/java/org/apache/doris/nereids/trees/plans/visitor/CommandVisitor.java

@@ -93,6 +93,7 @@
 import org.apache.doris.nereids.trees.plans.commands.ShowCollationCommand;
 import org.apache.doris.nereids.trees.plans.commands.ShowConfigCommand;
 import org.apache.doris.nereids.trees.plans.commands.ShowConstraintsCommand;
+import org.apache.doris.nereids.trees.plans.commands.ShowConvertLSCCommand;
 import org.apache.doris.nereids.trees.plans.commands.ShowCreateCatalogCommand;
 import org.apache.doris.nereids.trees.plans.commands.ShowCreateDatabaseCommand;
 import org.apache.doris.nereids.trees.plans.commands.ShowCreateMTMVCommand;
@@ -695,6 +696,10 @@ default R visitShowQueryProfileCommand(ShowQueryProfileCommand showQueryProfileC
         return visitCommand(showQueryProfileCommand, context);
     }
 
+    default R visitShowConvertLscCommand(ShowConvertLSCCommand showConvertLSCCommand, C context) {
+        return visitCommand(showConvertLSCCommand, context);
+    }
+
     default R visitSwitchCommand(SwitchCommand switchCommand, C context) {
         return visitCommand(switchCommand, context);
     }

regression-test/suites/nereids_p0/ddl/show/show_light_schema_change_process_nereids

@@ -0,0 +1,25 @@
+// 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.
+
+suite("show_light_schema_change_process_nereids") {
+    // can not use qt command since the output change based on cluster and backend ip
+   sql """drop database if exists testdb;""
+   sql """create database testdb;"""
+   checkNereidsExecute("""SHOW CONVERT_LIGHT_SCHEMA_CHANGE_PROCESS FROM testdb;""")
+   checkNereidsExecute("""SHOW CONVERT_LIGHT_SCHEMA_CHANGE_PROCESS;""")
+   sql """drop database if exists testdb;""
+}