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https://issues.apache.org/jira/browse/IGNITE-25552?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Maksim Zhuravkov updated IGNITE-25552:
--------------------------------------
Description:
FormatModels shipped with Apache Calcite can not be used to implement an SQL
standard compliant parser. Consider the following code:
{code:java}
{
List<FormatElement> elements =
FormatModels.DEFAULT.parseNoCache("YYYY/MM/DD");
System.err.println(elements);
}
{
List<FormatElement> elements =
FormatModels.DEFAULT.parseNoCache("RR/MM/DD");
System.err.println(elements);
}
{
List<FormatElement> elements =
FormatModels.DEFAULT.parseNoCache("RR/MM/DD HH.MI");
System.err.println(elements);
}
{code}
Output:
{code:java}
[Y, Y, Y, Y, /, MM, /, D, D] - 4 Ys instead of YYYY
[RR/, MM, /, D, D] - RR is a literal
[RR/, MM, /, D, D, HH., MI] - HH is a literal
{code}
To resolve these issues, we have to implement a parser for a SQL datetime
format. The parser should collect fields values from a string given some format
pattern.
was:
FormatModels shipped with Apache Calcite can not be used to implement an SQL
standard compliant parser. Consider the following code:
{code:java}
{
List<FormatElement> elements =
FormatModels.DEFAULT.parseNoCache("YYYY/MM/DD");
System.err.println(elements);
}
{
List<FormatElement> elements =
FormatModels.DEFAULT.parseNoCache("RR/MM/DD");
System.err.println(elements);
}
{
List<FormatElement> elements =
FormatModels.DEFAULT.parseNoCache("RR/MM/DD HH.MI");
System.err.println(elements);
}
{code}
Output:
{code:java}
[Y, Y, Y, Y, /, MM, /, D, D] - 4 Ys instead of YYYY
[RR/, MM, /, D, D] - RR is a literal
[RR/, MM, /, D, D, HH., MI] - HH is a literal
{code}
To resolve these issues, we have to implement a parser for a SQL datetime
format.
> Sql. Date/Time. Parser for SQL datetime format
> ----------------------------------------------
>
> Key: IGNITE-25552
> URL: https://issues.apache.org/jira/browse/IGNITE-25552
> Project: Ignite
> Issue Type: Improvement
> Components: sql ai3
> Reporter: Maksim Zhuravkov
> Assignee: Maksim Zhuravkov
> Priority: Major
> Labels: ignite-3
> Time Spent: 10m
> Remaining Estimate: 0h
>
> FormatModels shipped with Apache Calcite can not be used to implement an SQL
> standard compliant parser. Consider the following code:
> {code:java}
> {
> List<FormatElement> elements =
> FormatModels.DEFAULT.parseNoCache("YYYY/MM/DD");
> System.err.println(elements);
> }
> {
> List<FormatElement> elements =
> FormatModels.DEFAULT.parseNoCache("RR/MM/DD");
> System.err.println(elements);
> }
> {
> List<FormatElement> elements =
> FormatModels.DEFAULT.parseNoCache("RR/MM/DD HH.MI");
> System.err.println(elements);
> }
> {code}
> Output:
> {code:java}
> [Y, Y, Y, Y, /, MM, /, D, D] - 4 Ys instead of YYYY
> [RR/, MM, /, D, D] - RR is a literal
> [RR/, MM, /, D, D, HH., MI] - HH is a literal
> {code}
> To resolve these issues, we have to implement a parser for a SQL datetime
> format. The parser should collect fields values from a string given some
> format pattern.
>
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