xuzifu666 commented on code in PR #4406:
URL: https://github.com/apache/calcite/pull/4406#discussion_r2128206453
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core/src/main/java/org/apache/calcite/sql/dialect/PrestoSqlDialect.java:
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@@ -248,10 +278,12 @@ public static void unparseMapValue(SqlWriter writer,
SqlCall call,
*/
public static SqlCall convertMapValueCall(SqlCall call) {
boolean unnestMap = call.operandCount() > 0
- && call.getOperandList().stream().allMatch(operand -> operand
instanceof SqlLiteral);
+ && (call.getOperandList().get(0) instanceof SqlLiteral
Review Comment:
This is to solve the problem of nested type conversion. According to the
original logic, a case like **cast(map(...) as MAP<FLOAT, MAP<FLOAT,FLOAT>>)**
will directly return call without converting the related types. @mihaibudiu
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