liyafan82 commented on a change in pull request #2242:
URL: https://github.com/apache/calcite/pull/2242#discussion_r517087047
##########
File path:
core/src/main/java/org/apache/calcite/sql/fun/SqlStdOperatorTable.java
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@@ -482,6 +500,7 @@
* <p>Its precedence is less than the prefix {@link #UNARY_PLUS +}
* and {@link #UNARY_MINUS -} operators.
*/
+ @LibraryOperator(libraries = {STANDARD})
public static final SqlBinaryOperator MINUS =
new SqlMonotonicBinaryOperator(
"-",
Review comment:
Right, as @julianhyde pointed out, some operators are only for internal
use
(https://issues.apache.org/jira/browse/CALCITE-4363?focusedCommentId=17223122&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-17223122).
In addition, some operators are supported by most databases, but not all
databases (e.g. sqrt).
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