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https://issues.apache.org/jira/browse/CALCITE-6480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17867165#comment-17867165
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kate commented on CALCITE-6480:
-------------------------------
[~julianhyde] Maybe I can write the code like this?
{code:java}
@Override public void unparseBoolLiteral(SqlWriter writer,
SqlLiteral literal, int leftPrec, int rightPrec) {
Boolean value = (Boolean) literal.getValue();
if (value == null || majorVersion >= 23) {
super.unparseBoolLiteral(writer, literal, leftPrec, rightPrec);
return;
}
// low version oracle not support bool literal
final SqlWriter.Frame frame = writer.startList("(", ")");
writer.literal("1");
writer.setNeedWhitespace(true);
writer.sep(SqlStdOperatorTable.EQUALS.getName());
writer.setNeedWhitespace(true);
writer.literal(value ? "1" : "0");
writer.endList(frame);
}{code}
> OracleDialect does not support CASE WHEN returning boolean
> ----------------------------------------------------------
>
> Key: CALCITE-6480
> URL: https://issues.apache.org/jira/browse/CALCITE-6480
> Project: Calcite
> Issue Type: Wish
> Components: core
> Reporter: kate
> Priority: Minor
>
> Our requirement is to use Calcite to translate queries into different
> dialects. During validation in the TPC-DS scenario, we found that {{Oracle}}
> does not support SQL statements like
> {code:java}
> SELECT * FROM xxx
> WHERE CASE WHEN a > 10 THEN b < 5 ELSE c > 0 END;{code}
> Therefore, we hope to remove such predicates at the dialect like Oracle.
>
>
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