feat: optimize collecting entity when match empty column in entityCollecting context

Author: zhaoge

src/grammar/flink/FlinkSqlParser.g4

@@ -509,6 +509,7 @@ columnProjectItem
     | selectLiteralColumnName (columnAlias | KW_AS? expression)?
     | tableAllColumns columnAlias?
     | selectExpressionColumnName (columnAlias | KW_AS? columnName)?
+    | {this.shouldMatchEmpty()}? emptyColumn
     ;
 
 selectWindowItemColumnName

src/grammar/hive/HiveSqlParser.g4

@@ -1536,6 +1536,7 @@ selectItem
             | KW_AS LPAREN alias=id_ (COMMA alias=id_)* RPAREN
         )?
     )
+    | {this.shouldMatchEmpty()}? emptyColumn
     ;
 
 selectLiteralColumnName

src/grammar/impala/ImpalaSqlParser.g4

@@ -823,6 +823,7 @@ selectItem
     : selectLiteralColumnName columnAlias?
     | selectExpressionColumnName columnAlias?
     | tableAllColumns
+    | {this.shouldMatchEmpty()}? emptyColumn
     ;
 
 columnAlias

src/grammar/postgresql/PostgreSqlParser.g4

@@ -2634,6 +2634,7 @@ targetList
 targetEl
     : tableAllColumns                                                                    # target_star
     | (selectLiteralColumnName | selectExpressionColumnName) (KW_AS? alias=identifier |) # target_label
+    | {this.shouldMatchEmpty()}? emptyColumn                                             # target_empty
     ;
 
 tableAllColumns
@@ -2733,7 +2734,6 @@ columnName
 
 columnNamePath
     : colId optIndirection
-    | {this.shouldMatchEmpty()}? (colId DOT emptyColumn | emptyColumn)
     ;
 
 columnNameCreate

src/grammar/spark/SparkSqlParser.g4

@@ -850,6 +850,7 @@ namedExpression
     : (tableAllColumns | selectLiteralColumnName | selectExpressionColumnName) (
         KW_AS? (alias=errorCapturingIdentifier | identifierList)
     )?
+    | {this.shouldMatchEmpty()}? emptyColumn
     ;
 
 namedExpressionSeq