strongduanmu commented on a change in pull request #10377:
URL: https://github.com/apache/shardingsphere/pull/10377#discussion_r634278568
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File path:
shardingsphere-sql-parser/shardingsphere-sql-parser-statement/src/main/java/org/apache/shardingsphere/sql/parser/sql/dialect/statement/mysql/dal/MySQLExplainStatement.java
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@@ -17,21 +17,29 @@
package org.apache.shardingsphere.sql.parser.sql.dialect.statement.mysql.dal;
-import lombok.Getter;
import lombok.Setter;
import lombok.ToString;
import
org.apache.shardingsphere.sql.parser.sql.common.segment.generic.table.SimpleTableSegment;
-import
org.apache.shardingsphere.sql.parser.sql.common.statement.AbstractSQLStatement;
-import
org.apache.shardingsphere.sql.parser.sql.common.statement.dal.DALStatement;
+import
org.apache.shardingsphere.sql.parser.sql.common.statement.dal.ExplainStatement;
import
org.apache.shardingsphere.sql.parser.sql.dialect.statement.mysql.MySQLStatement;
+import java.util.Optional;
+
/**
- * MySQL describe statement.
+ * MySQL explain statement.
*/
-@Getter
@Setter
@ToString
-public final class MySQLDescribeStatement extends AbstractSQLStatement
implements DALStatement, MySQLStatement {
+public final class MySQLExplainStatement extends ExplainStatement implements
MySQLStatement {
private SimpleTableSegment table;
Review comment:
> This field will be removed `SQLStatement` later on, won't it?
@tristaZero In MySQL, explain also has the describe function. When explain
is used in this scenario, a `table` field will be parsed, so this field is
necessary.
You can refer to the explain grammar:
```
{EXPLAIN | DESCRIBE | DESC}
tbl_name [col_name | wild]
{EXPLAIN | DESCRIBE | DESC}
[explain_type]
{explainable_stmt | FOR CONNECTION connection_id}
{EXPLAIN | DESCRIBE | DESC} ANALYZE [FORMAT = TREE] select_statement
explain_type: {
FORMAT = format_name
}
format_name: {
TRADITIONAL
| JSON
| TREE
}
explainable_stmt: {
SELECT statement
| TABLE statement
| DELETE statement
| INSERT statement
| REPLACE statement
| UPDATE statement
}
```
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