ritesh-kapoor commented on a change in pull request #1733: [CALCITE-3679] Allow
lambda expressions in SQL queries
URL: https://github.com/apache/calcite/pull/1733#discussion_r401331638
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File path:
core/src/main/java/org/apache/calcite/sql/fun/SqlLibraryOperators.java
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@@ -304,6 +305,17 @@ private SqlLibraryOperators() {
OperandTypes.CHARACTER,
SqlFunctionCategory.STRING);
+ @LibraryOperator(libraries = {MYSQL})
+ public static final SqlFunction MAP_FILTER =
+ new SqlFunction("MAP_FILTER",
+ SqlKind.OTHER_FUNCTION,
+ ReturnTypes.cascade(ReturnTypes.ARG0, SqlTypeTransforms.TO_NULLABLE),
+ null,
+ OperandTypes.sequence("MAP_FILTER(<ANY>, <LAMBDA(BOOLEAN, ANY,
ANY)>)",
+ OperandTypes.family(SqlTypeFamily.MAP),
+ OperandTypes.lambda(SqlTypeFamily.BOOLEAN, SqlTypeFamily.ANY,
SqlTypeFamily.ANY)),
+ SqlFunctionCategory.SYSTEM);
Review comment:
The Map Function accepts lambda which returns boolean value and takes two
arguments of any type. This seems to be correct.
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