delete the note that yield is optional (#1966)

vesoft-inc · Feb 21, 2023 · f06a6da · f06a6da
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diff --git a/docs-2.0/3.ngql-guide/5.operators/4.pipe.md b/docs-2.0/3.ngql-guide/5.operators/4.pipe.md
@@ -31,8 +31,6 @@ nebula> GO FROM "player100" OVER follow \
 +-------------+
 ```
 
-If there is no `YIELD` clause to define the output, the destination vertex ID is returned by default. If a YIELD clause is applied, the output is defined by the YIELD clause.
-
 Users must define aliases in the `YIELD` clause for the reference operator `$-` to use, just like `$-.dstid` in the preceding example.
 
 ## Performance tips