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https://issues.apache.org/jira/browse/TRAFODION-3155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16554605#comment-16554605
]
ASF GitHub Bot commented on TRAFODION-3155:
-------------------------------------------
Github user DaveBirdsall commented on a diff in the pull request:
https://github.com/apache/trafodion/pull/1658#discussion_r204855585
--- Diff: core/sql/parser/sqlparser.y ---
@@ -19430,6 +19432,124 @@ exists_predicate : TOK_EXISTS rel_subquery
$$ = new (PARSERHEAP()) Exists($2);
}
+overlaps_predicate : value_expression_list_paren TOK_OVERLAPS
value_expression_list_paren
+ {
+ ItemExprList exprList1($1, PARSERHEAP());
+ ItemExprList exprList2($3, PARSERHEAP());
+ //Syntax Rules:
+ // 1) The degrees of <row value predicand 1> and <row value
predicand 2> shall both be 2.
+ if ((exprList1.entries() != 2)
+ || (exprList1.entries() != exprList2.entries()))
+ {
+ *SqlParser_Diags << DgSqlCode(-4077)
--- End diff --
This is OK to have in the Parser, as it depends only on syntax.
> New feature: Implementing the OVERLAPS predicate
> ------------------------------------------------
>
> Key: TRAFODION-3155
> URL: https://issues.apache.org/jira/browse/TRAFODION-3155
> Project: Apache Trafodion
> Issue Type: New Feature
> Reporter: zhang.lei
> Assignee: zhang.lei
> Priority: Major
>
> This feature is implemented on the basis of [<ANSI SQL-2003>8.13 overlaps
> predicate, page
> 407|http://grigoras.perso.enseeiht.fr/ens/bd/5WD-02-Foundation-2003-09.pdf],
> Here are some descriptions of it:
> *Function*: Specify a test for an overlap between two datetime periods.
> *Format*:
> <overlaps predicate> ::= <overlaps predicate part 1> <overlaps predicate part
> 2>
> <overlaps predicate part 1> ::= <row value predicand 1>
> <overlaps predicate part 2> ::= OVERLAPS <row value predicand 2>
> <row value predicand 1> ::= <row value predicand>
> <row value predicand 2> ::= <row value predicand>
> *Syntax Rules:*
> 1) The degrees of <row value predicand 1> and <row value predicand 2> shall
> both be 2.
> 2) The declared types of the first field of <row value predicand 1> and the
> first field of <row value predicand
> 2> shall both be datetime data types and these data types shall be
> comparable.
> NOTE 195 — Two datetimes are comparable only if they have the same <primary
> datetime field>s; see Subclause 4.6.2, “Datetimes”.
> 3) The declared type of the second field of each <row value predicand> shall
> be a datetime data type or
> INTERVAL.
> Case:
> a) If the declared type is INTERVAL, then the precision of the declared type
> shall be such that the interval
> can be added to the datetime data type of the first column of the <row value
> predicand>.
> b) If the declared type is a datetime data type, then it shall be comparable
> with the datetime data type of
> the first column of the <row value predicand>.
> *Example:*
> *--<comment> SELECT WHERE (date, date) OVERLAPS (date, date)*
> >> select 1 from dual
> +> where (date'2018-07-19', date'2018-08-19')
> +> overlaps (date'2018-07-20', date'2018-08-20');
> (EXPR)
> ------
> 1
> — 1 row(s) selected.
>
> *--<comment> SELECT WHERE(date, interval) OVERLAPS (date, date)*
> >> select 1 from dual
> +> where (date'2018-07-19', interval '01-02' year to month)
> +> overlaps (date'2018-07-20', date'2018-08-20');
> (EXPR)
> ------
> 1
> — 1 row(s) selected.
> >> select 1 from dual;
> +> where (date'2018-07-19', -interval '03-02' year to month)
> +> overlaps (date'2018-07-19', date'2018-08-18');
> — 0 row(s) selected.
> *>>-- <comment> SELECT WHERE (date, interval) OVERLAPS (date, interval)*
> >> select 1 from dual;
> +> where (date'2018-07-20', interval '1' month)
> +> overlaps (date'2018-07-19', interval '01-02' year to month);
> (EXPR)
> ------
> 1
> — 1 row(s) selected.
>
> *>>-- <comment> SELECT WHERE (time, time) OVERLAPS (time, time);*
> >> select 1 from dual
> +> where (time'01:02:03', time'02:03:04')
> +> overlaps (time'03:04:05', time'02:01:01');
> (EXPR)
> ------
> 1
> --- 1 row(s) selected.
> >>
> *>>-- <comment> SELECT WHERE (time, interval) OVERLAPS (time, interval);*
> >> select 0 from dual
> +> where (time'03:04:06', interval '04:03:04' hour to second )
> +> overlaps (time'03:04:05', -interval'02:01:01' hour to second);
>
> *>>--<comment> SELECT WHERE (timestamp, timerstamp) OVERLAPS (timestamp,
> timestamp);*
> >> select 1 from btsel01
> +> where (timestamp'2018-07-19 10:00:00', timestamp'2018-08-19 01:00:00')
> +> overlaps (timestamp'2018-07-19 01:00:00', current_timestamp)
> (EXPR)
> ------
> 1
> --- 1 row(s) selected.
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