[shardingsphere] branch master updated: Fix NoSuchElementException when execute preview cursor statement (#18241)

[tuichenchuxin]

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tuichenchuxin pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/shardingsphere.git


The following commit(s) were added to refs/heads/master by this push:
     new aac0d3026e0 Fix NoSuchElementException when execute preview cursor 
statement (#18241)
aac0d3026e0 is described below

commit aac0d3026e00575114701be603ec189a02a45747
Author: Zhengqiang Duan <duanzhengqi...@apache.org>
AuthorDate: Wed Jun 8 17:49:24 2022 +0800

    Fix NoSuchElementException when execute preview cursor statement (#18241)
---
 .../data/impl/SchemaAssignedDatabaseBackendHandler.java     |  7 ++++---
 .../distsql/ral/advanced/PreviewDistSQLBackendHandler.java  | 13 +++++++++++++
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git 
a/shardingsphere-proxy/shardingsphere-proxy-backend/src/main/java/org/apache/shardingsphere/proxy/backend/text/data/impl/SchemaAssignedDatabaseBackendHandler.java
 
b/shardingsphere-proxy/shardingsphere-proxy-backend/src/main/java/org/apache/shardingsphere/proxy/backend/text/data/impl/SchemaAssignedDatabaseBackendHandler.java
index e57ee177f3e..051dcfdb6f9 100644
--- 
a/shardingsphere-proxy/shardingsphere-proxy-backend/src/main/java/org/apache/shardingsphere/proxy/backend/text/data/impl/SchemaAssignedDatabaseBackendHandler.java
+++ 
b/shardingsphere-proxy/shardingsphere-proxy-backend/src/main/java/org/apache/shardingsphere/proxy/backend/text/data/impl/SchemaAssignedDatabaseBackendHandler.java
@@ -95,14 +95,15 @@ public final class SchemaAssignedDatabaseBackendHandler 
implements DatabaseBacke
         if (statementContext instanceof CursorStatementContext) {
             connectionSession.getCursorDefinitions().put(cursorName, 
(CursorStatementContext) statementContext);
         }
-        if (statementContext instanceof CloseStatementContext) {
-            FetchOrderByValueQueuesHolder.get().remove(cursorName);
-        }
         if (statementContext instanceof CursorDefinitionAware) {
             CursorStatementContext cursorStatementContext = 
connectionSession.getCursorDefinitions().get(cursorName);
             Preconditions.checkArgument(null != cursorStatementContext, 
"Cursor %s does not exist.", cursorName);
             ((CursorDefinitionAware) 
statementContext).setUpCursorDefinition(cursorStatementContext);
         }
+        if (statementContext instanceof CloseStatementContext) {
+            FetchOrderByValueQueuesHolder.get().remove(cursorName);
+            connectionSession.getCursorDefinitions().remove(cursorName);
+        }
     }
     
     @Override
diff --git 
a/shardingsphere-proxy/shardingsphere-proxy-backend/src/main/java/org/apache/shardingsphere/proxy/backend/text/distsql/ral/advanced/PreviewDistSQLBackendHandler.java
 
b/shardingsphere-proxy/shardingsphere-proxy-backend/src/main/java/org/apache/shardingsphere/proxy/backend/text/distsql/ral/advanced/PreviewDistSQLBackendHandler.java
index 10b2121f1d4..536807169b7 100644
--- 
a/shardingsphere-proxy/shardingsphere-proxy-backend/src/main/java/org/apache/shardingsphere/proxy/backend/text/distsql/ral/advanced/PreviewDistSQLBackendHandler.java
+++ 
b/shardingsphere-proxy/shardingsphere-proxy-backend/src/main/java/org/apache/shardingsphere/proxy/backend/text/distsql/ral/advanced/PreviewDistSQLBackendHandler.java
@@ -22,7 +22,10 @@ import com.google.common.base.Strings;
 import 
org.apache.shardingsphere.distsql.parser.statement.ral.advanced.PreviewStatement;
 import org.apache.shardingsphere.infra.binder.LogicSQL;
 import org.apache.shardingsphere.infra.binder.SQLStatementContextFactory;
+import org.apache.shardingsphere.infra.binder.aware.CursorDefinitionAware;
 import org.apache.shardingsphere.infra.binder.statement.SQLStatementContext;
+import 
org.apache.shardingsphere.infra.binder.statement.ddl.CursorStatementContext;
+import org.apache.shardingsphere.infra.binder.type.CursorAvailable;
 import org.apache.shardingsphere.infra.binder.type.TableAvailable;
 import org.apache.shardingsphere.infra.config.props.ConfigurationPropertyKey;
 import org.apache.shardingsphere.infra.context.kernel.KernelProcessor;
@@ -107,6 +110,9 @@ public final class PreviewDistSQLBackendHandler extends 
QueryableRALBackendHandl
         if (sqlStatementContext instanceof TableAvailable) {
             ((TableAvailable) 
sqlStatementContext).getTablesContext().getDatabaseName().ifPresent(SQLStatementDatabaseHolder::set);
         }
+        if (sqlStatementContext instanceof CursorAvailable && 
sqlStatementContext instanceof CursorDefinitionAware) {
+            setUpCursorDefinition(sqlStatementContext);
+        }
         ShardingSphereDatabase database = 
ProxyContext.getInstance().getDatabase(connectionSession.getDatabaseName());
         if (!database.isComplete()) {
             throw new RuleNotExistedException();
@@ -119,6 +125,13 @@ public final class PreviewDistSQLBackendHandler extends 
QueryableRALBackendHandl
         return 
executionUnits.stream().map(this::buildRow).collect(Collectors.toList());
     }
     
+    private void setUpCursorDefinition(final SQLStatementContext<?> 
sqlStatementContext) {
+        String cursorName = ((CursorAvailable) 
sqlStatementContext).getCursorName().getIdentifier().getValue().toLowerCase();
+        CursorStatementContext cursorStatementContext = 
connectionSession.getCursorDefinitions().get(cursorName);
+        Preconditions.checkArgument(null != cursorStatementContext, "Cursor %s 
does not exist.", cursorName);
+        ((CursorDefinitionAware) 
sqlStatementContext).setUpCursorDefinition(cursorStatementContext);
+    }
+    
     private List<Object> buildRow(final ExecutionUnit unit) {
         return Arrays.asList(unit.getDataSourceName(), 
unit.getSqlUnit().getSql());
     }