Change the table comment after created the table is not supported now?
Like mysql : ALTER TABLE [tableName] COMMNET [comment]; 
The sql "ALTER TABLE `system`.tables UPDATE Comment='test' WHERE NAME='t1';" also not supported!!!
My version is '21.9.4.35'。
#include <Interpreters/addMissingDefaults.h>
#include <Storages/StorageBuffer.h>
#include <Storages/StorageFactory.h>
#include <Storages/AlterCommands.h>
#include <Parsers/ASTInsertQuery.h>
#include <Parsers/ASTIdentifier.h>
#include <Parsers/ASTLiteral.h>
#include <Parsers/ASTExpressionList.h>
#include <Common/CurrentMetrics.h>
#include <Common/MemoryTracker.h>
#include <Common/FieldVisitorConvertToNumber.h>
#include <Common/quoteString.h>
#include <Common/typeid_cast.h>
#include <Common/ProfileEvents.h>
#include <base/logger_useful.h>
#include <base/getThreadId.h>
#include <base/range.h>
#include <Processors/QueryPlan/ExpressionStep.h>
#include <Processors/Transforms/FilterTransform.h>
#include <Processors/Transforms/ExpressionTransform.h>
#include <Processors/Sinks/SinkToStorage.h>
#include <Processors/Sources/SourceWithProgress.h>
#include <Processors/QueryPlan/QueryPlan.h>
#include <Processors/QueryPlan/SettingQuotaAndLimitsStep.h>
#include <Processors/QueryPlan/ReadFromPreparedSource.h>
#include <Processors/QueryPlan/UnionStep.h>
#include <Processors/QueryPlan/Optimizations/QueryPlanOptimizationSettings.h>
#include <Processors/QueryPlan/BuildQueryPipelineSettings.h>
#include <Processors/Executors/PushingPipelineExecutor.h>
namespace ProfileEvents