public class TStarColumnPushDownResolver extends TParseTreeVisitor
Constructor and Description |
---|
TStarColumnPushDownResolver(TStatementList sqls,
gudusoft.gsqlparser.compiler.TContext scope) |
Modifier and Type | Method and Description |
---|---|
void |
postVisit(TSelectSqlStatement stmt) |
void |
preVisit(TSelectSqlStatement stmt)
自顶向下,把从星号字段衍生出来的字段回溯到初始的表中,
例如下面语句中的 col_1, col_11 回溯到 table_a
SELECT col_1, col_11,col_2
FROM (
select *
FROM (select * from table_a) ta
) a
LEFT OUTER JOIN (
select id, col_2
FROM table_b
) b on a.id = b.id
|
void |
resolve() |
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public TStarColumnPushDownResolver(TStatementList sqls, gudusoft.gsqlparser.compiler.TContext scope)
public void resolve()
public void preVisit(TSelectSqlStatement stmt)
preVisit
in class TParseTreeVisitor
public void postVisit(TSelectSqlStatement stmt)
postVisit
in class TParseTreeVisitor
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