XuQianJin-Stars commented on a change in pull request #11186:
[FLINK-16200][sql] Support JSON_EXISTS for blink planner
URL: https://github.com/apache/flink/pull/11186#discussion_r399003672
##########
File path:
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/codegen/calls/FunctionGenerator.scala
##########
@@ -801,6 +801,20 @@ object FunctionGenerator {
new MethodCallGen(
BuiltInMethod.IS_JSON_SCALAR.method)))
+ addSqlFunctionMethod(
+ JSON_EXISTS,
+ Seq(CHAR, CHAR),
Review comment:
> According to SQL 2016 Standard:
>
> ```
> <JSON API common syntax> ::= <JSON context item> <comma> <JSON path
specification> [ AS <JSON table path name> ] [ <JSON passing clause> ]
> <JSON context item> ::= <JSON value expression>
> <JSON path specification> ::= <character string literal>
> ```
>
> Second parameter can only be string literal, and in Flink, it's `CHAR`
type.
Thank you very much for your analysis, it has helped me a lot.
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