Github user vvysotskyi commented on the pull request:
https://github.com/apache/drill/commit/9073aed67d89e8b2188870d6c812706085c9c41b#commitcomment-27970713
In logical/src/main/java/org/apache/drill/common/expression/SchemaPath.java:
In logical/src/main/java/org/apache/drill/common/expression/SchemaPath.java
on line 46:
@gparai, for the case, when `DYNAMIC_STAR` is passed into parseFromString()
method, the result will be the same, as for the passing "*" string - error.
`DYNAMIC_STAR` is used in the same places, where usual column names are used.
But column names may contain some symbols which also breaks Lexer/Parser.
Therefore column names are wrapped into `SchemaPath` using `getSimplePath()`
method. `DYNAMIC_STAR` also wrapped into the `SchemaPath`, and its string
representation may be received using `SchemaPath.STAR_COLUMN.toExpr()` ->
"\`**\`". So `SchemaPath.parseFromString(SchemaPath.STAR_COLUMN.toExpr())` is
able to parse it.
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