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Fernando Díaz edited comment on FLINK-6895 at 3/15/18 12:27 PM: ---------------------------------------------------------------- Taking a look at this [MySQL STR_TO_DATE|https://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_str-to-date] it seems that the correct approach would be: * Return a DATETIME ({{java.sql.Timestamp}}) value if the format string contains both date and time parts. * Return a DATE ({{java.sql.Date}}) if the string contains date only. * Return a TIME ({{java.sql.Time}}) if the string contains time only. {{java.util.Date}} it's a superclass of these three classes (see [Class Date|https://docs.oracle.com/javase/7/docs/api/java/util/Date.html]). What do you think? Maybe it's a good idea to use this as the return type. was (Author: fdiazgon): Taking a look at this [MySQL STR_TO_DATE]https://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_str-to-date] it seems that the correct approach would be: * Return a DATETIME ({{java.sql.Timestamp}}) value if the format string contains both date and time parts. * Return a DATE ({{java.sql.Date}}) if the string contains date only. * Return a TIME ({{java.sql.Time}}) if the string contains time only. {{java.util.Date}} it's a superclass of these three classes (see [Class Date|https://docs.oracle.com/javase/7/docs/api/java/util/Date.html]). What do you think? Maybe it's a good idea to use this as the return type. > Add STR_TO_DATE supported in SQL > -------------------------------- > > Key: FLINK-6895 > URL: https://issues.apache.org/jira/browse/FLINK-6895 > Project: Flink > Issue Type: Sub-task > Components: Table API & SQL > Affects Versions: 1.4.0 > Reporter: sunjincheng > Assignee: Aegeaner > Priority: Major > > STR_TO_DATE(str,format) This is the inverse of the DATE_FORMAT() function. It > takes a string str and a format string format. STR_TO_DATE() returns a > DATETIME value if the format string contains both date and time parts, or a > DATE or TIME value if the string contains only date or time parts. If the > date, time, or datetime value extracted from str is illegal, STR_TO_DATE() > returns NULL and produces a warning. > * Syntax: > STR_TO_DATE(str,format) > * Arguments > **str: - > **format: - > * Return Types > DATAETIME/DATE/TIME > * Example: > STR_TO_DATE('01,5,2013','%d,%m,%Y') -> '2013-05-01' > SELECT STR_TO_DATE('a09:30:17','a%h:%i:%s') -> '09:30:17' > * See more: > ** [MySQL| > https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_str-to-date] -- This message was sent by Atlassian JIRA (v7.6.3#76005)