use constants

Signed-off-by: tison <[email protected]>

src/operator/src/statement/ddl.rs

@@ -37,7 +37,7 @@ use common_query::Output;
 use common_telemetry::{debug, info, tracing};
 use common_time::Timezone;
 use datatypes::prelude::ConcreteDataType;
-use datatypes::schema::RawSchema;
+use datatypes::schema::{RawSchema};
 use datatypes::value::Value;
 use lazy_static::lazy_static;
 use partition::expr::{Operand, PartitionExpr, RestrictedOp};
@@ -59,7 +59,7 @@ use store_api::metric_engine_consts::{LOGICAL_TABLE_METADATA_KEY, METRIC_ENGINE_
 use substrait::{DFLogicalSubstraitConvertor, SubstraitPlan};
 use table::dist_table::DistTable;
 use table::metadata::{self, RawTableInfo, RawTableMeta, TableId, TableInfo, TableType};
-use table::requests::{AlterKind, AlterTableRequest, TableOptions};
+use table::requests::{AlterKind, AlterTableRequest, COMMENT_KEY, TableOptions};
 use table::TableRef;
 
 use super::StatementExecutor;
@@ -1142,7 +1142,7 @@ fn create_table_info(
     };
 
     let desc = if create_table.desc.is_empty() {
-        create_table.table_options.get("comment").cloned()
+        create_table.table_options.get(COMMENT_KEY).cloned()
     } else {
         Some(create_table.desc.clone())
     };