dssysolyatin commented on code in PR #3134:
URL: https://github.com/apache/calcite/pull/3134#discussion_r1154189969
##########
core/src/main/java/org/apache/calcite/sql/fun/SqlLibraryOperators.java:
##########
@@ -863,6 +863,16 @@ static RelDataType deriveTypeSplit(SqlOperatorBinding
operatorBinding,
OperandTypes.STRING.or(OperandTypes.BINARY),
SqlFunctionCategory.STRING);
+ /** The "TO_CHAR(timestamp, format)" function;
+ * converts {@code timestamp} to string according to the given {@code
format}.
+ */
+ @LibraryOperator(libraries = {MYSQL, ORACLE, POSTGRESQL})
+ public static final SqlFunction TO_CHAR =
Review Comment:
PostgreSQL has 3 different to_char:
`to_char ( timestamp, text ) → text`
`to_char ( interval, text ) → text`
`to_char ( numeric_type, text ) → text`
You implemented only it for timestamp type. Can you specify it in jira ticket
##########
babel/src/test/resources/sql/postgresql.iq:
##########
@@ -57,3 +57,8 @@ SELECT * FROM sal_emp;
NAME, PAY_BY_QUARTER, SCHEDULE
Bill, [10000, 10000, 10000, 10000], [[meeting, lunch], [training,
presentation]]
!ok
+
+select to_char(timestamp '2022-06-03 12:15:48.678', 'YYYY-MM-DD HH24:MI:SS.MS
TZ');
Review Comment:
Can you add more tests for `toChar(DataContext ctx, long timestamp, String
pattern)` function in org.apache.calcite.test.SqlFunctionsTest ?
##########
core/src/main/java/org/apache/calcite/adapter/enumerable/RexImpTable.java:
##########
@@ -583,6 +584,7 @@ Builder populate2() {
defineMethod(TIME, "time", NullPolicy.STRICT);
// Datetime formatting methods
+ map.put(TO_CHAR, new ToCharImplementor());
Review Comment:
Use `defineMethod` instead of `ToChatImplementor`
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