danny0405 commented on a change in pull request #1568: [CALCITE-3486] In JDBC
adapter, when generating ROW value expression, generates the ROW keyword only
if the dialect allows it (quxiucheng)
URL: https://github.com/apache/calcite/pull/1568#discussion_r345169088
##########
File path: core/src/main/java/org/apache/calcite/sql/SqlDialect.java
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@@ -448,6 +448,31 @@ public void unparseCall(SqlWriter writer, SqlCall call,
int leftPrec,
call.getOperator().unparse(writer, call, leftPrec, rightPrec);
}
+ public void unparseRow(SqlWriter writer,
+ SqlCall call, int leftPrec, int rightPrec) {
+ if (getConformance().allowExplicitRowValueConstructor()) {
+ SqlUtil.unparseFunctionSyntax(call.getOperator(), writer, call);
+ } else {
+ if (" ".equals(call.getOperator().getName())) {
+ writer.print(call.getOperator().getName());
+ }
+ if (writer.isAlwaysUseParentheses()) {
+ for (SqlNode operand : call.getOperandList()) {
+ writer.sep(",");
Review comment:
Can you explain why we need this decision ?
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