julianhyde commented on code in PR #2878:
URL: https://github.com/apache/calcite/pull/2878#discussion_r953386003
##########
core/src/main/java/org/apache/calcite/runtime/SqlFunctions.java:
##########
@@ -462,6 +462,16 @@ public static ByteString right(ByteString s, int n) {
return s.substring(len - n);
}
+ /**
+ * SQL CHAR(int) function.
+ */
Review Comment:
explain the difference between this and `chr`. It isn't int vs long.
##########
core/src/main/java/org/apache/calcite/sql/type/ReturnTypes.java:
##########
@@ -347,6 +347,13 @@ public static SqlCall stripSeparator(SqlCall call) {
public static final SqlReturnTypeInference CHAR =
explicit(SqlTypeName.CHAR);
+ /**
+ * Type-inference strategy whereby the result type of a call is a nullable
+ * Char.
+ */
+ public static final SqlReturnTypeInference CHAR_FORCE_NULLABLE =
+ CHAR.andThen(SqlTypeTransforms.FORCE_NULLABLE);
+
Review Comment:
not 'nullable Char', but 'nullable CHAR(1)'
##########
testkit/src/main/java/org/apache/calcite/test/SqlOperatorTest.java:
##########
@@ -1492,9 +1492,6 @@ protected static Calendar getCalendarNotTooNear(int
timeUnit) {
f.checkScalar("{fn ASCII('ABC')}", "65", "INTEGER NOT NULL");
f.checkNull("{fn ASCII(cast(null as varchar(1)))}");
- if (false) {
- f.checkScalar("{fn CHAR(code)}", null, "");
- }
Review Comment:
Why remove this test? The goal of the change is to implement JDBC '{fn CHAR}'
##########
core/src/main/java/org/apache/calcite/sql/fun/SqlLibraryOperators.java:
##########
@@ -650,7 +650,16 @@ private SqlLibraryOperators() {
ReturnTypes.BIGINT_NULLABLE, null, OperandTypes.TIMESTAMP,
SqlFunctionCategory.TIMEDATE);
- @LibraryOperator(libraries = {ORACLE})
+ @LibraryOperator(libraries = {MYSQL, SPARK})
+ public static final SqlFunction CHAR =
+ new SqlFunction("CHAR",
+ SqlKind.OTHER_FUNCTION,
+ ReturnTypes.CHAR_FORCE_NULLABLE,
+ null,
+ OperandTypes.INTEGER,
+ SqlFunctionCategory.STRING);
+
+ @LibraryOperator(libraries = {ORACLE, POSTGRESQL})
Review Comment:
CHR and CHAR need javadoc
##########
core/src/main/java/org/apache/calcite/util/BuiltInMethod.java:
##########
@@ -339,6 +339,7 @@ public enum BuiltInMethod {
UPPER(SqlFunctions.class, "upper", String.class),
LOWER(SqlFunctions.class, "lower", String.class),
ASCII(SqlFunctions.class, "ascii", String.class),
+ CHAR(SqlFunctions.class, "charN", int.class),
REPEAT(SqlFunctions.class, "repeat", String.class, int.class),
Review Comment:
should this be `CHAR(SqlFunctions.class, "charN", long.class)`?
and don't you also need `CHR(SqlFunctions.class, "chr", long.class)`?
##########
core/src/main/java/org/apache/calcite/runtime/SqlFunctions.java:
##########
@@ -462,6 +462,16 @@ public static ByteString right(ByteString s, int n) {
return s.substring(len - n);
}
+ /**
+ * SQL CHAR(int) function.
+ */
Review Comment:
also make the javadoc consistent with other javadoc
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