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https://issues.apache.org/jira/browse/CALCITE-2854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16773857#comment-16773857
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Hongze Zhang commented on CALCITE-2854:
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Do you think it is reasonable to include a fix for UNARY_PLUS also? For keeping
the code robust.
Currently the operator UNARY_PLUS is automatically removed[1] when converting
SQL to relational algebras.
[1]
[https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/sql2rel/StandardConvertletTable.java#L194]
> code gen error for UNARY_MINUS operator call with decimal type operands
> -----------------------------------------------------------------------
>
> Key: CALCITE-2854
> URL: https://issues.apache.org/jira/browse/CALCITE-2854
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.18.0
> Reporter: Lai Zhou
> Assignee: Julian Hyde
> Priority: Major
> Labels: pull-request-available
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> case:
> {code:java}
> @Test public void test() throws Exception {
> final String cr = "create table t (a DECIMAL)";
> final String se = "select -a as aa from t";
> Connection c = connect();
> Statement s = c.createStatement();
> s.execute(cr);
> s.executeQuery(se);
> }
> {code}
> error msg:
> {code:java}
> Caused by: org.codehaus.commons.compiler.CompileException: Line 21, Column
> 71: Object of type "java.math.BigDecimal" cannot be converted to a numeric
> type
> {code}
> {code:java}
> public Object current() {
> final java.math.BigDecimal current = inputEnumerator.current() == null ?
> (java.math.BigDecimal) null :
> org.apache.calcite.runtime.SqlFunctions.toBigDecimal(inputEnumerator.current());
> return current == null ? (java.math.BigDecimal) null : - current;
> }
> {code}
> `- current` is not right ,we'd better constructor a new BigDecimal object to
> to replace this code snippet，like
> {code:java}
> return current == null ? (java.math.BigDecimal) null :
> SqlFunctions.negativeDecimal(current);
> {code}
>
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