Make OVERLAPS operators conform to SQL92 spec regarding NULL handling.
As I read it, the spec requires a non-null result in some cases where one of the inputs is NULL: specifically, if the other endpoint of that interval is between the endpoints of the other interval, then the result is known TRUE despite the missing endpoint. The spec could've been a lot simpler if they did not intend this behavior. I did not force an initdb for this change, but if you don't do one you'll still see the old strict-function behavior.
This commit is contained in:
Tom Lane
parent
8bb4dab94d
commit
821f4673ff
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/date.c,v 1.53 2000/12/03 14:51:01 thomas Exp $
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/date.c,v 1.54 2000/12/07 18:38:59 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -529,37 +529,122 @@ time_smaller(PG_FUNCTION_ARGS)
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PG_RETURN_TIMEADT((time1 < time2) ? time1 : time2);
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}
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/* overlaps_time()
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* Implements the SQL92 OVERLAPS operator.
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* Algorithm from Date and Darwen, 1997
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/* overlaps_time() --- implements the SQL92 OVERLAPS operator.
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*
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* Algorithm is per SQL92 spec. This is much harder than you'd think
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* because the spec requires us to deliver a non-null answer in some cases
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* where some of the inputs are null.
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*/
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Datum
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overlaps_time(PG_FUNCTION_ARGS)
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{
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TimeADT ts1 = PG_GETARG_TIMEADT(0);
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TimeADT te1 = PG_GETARG_TIMEADT(1);
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TimeADT ts2 = PG_GETARG_TIMEADT(2);
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TimeADT te2 = PG_GETARG_TIMEADT(3);
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/* The arguments are TimeADT, but we leave them as generic Datums
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* to avoid dereferencing nulls (TimeADT is pass-by-reference!)
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*/
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Datum ts1 = PG_GETARG_DATUM(0);
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Datum te1 = PG_GETARG_DATUM(1);
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Datum ts2 = PG_GETARG_DATUM(2);
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Datum te2 = PG_GETARG_DATUM(3);
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bool ts1IsNull = PG_ARGISNULL(0);
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bool te1IsNull = PG_ARGISNULL(1);
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bool ts2IsNull = PG_ARGISNULL(2);
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bool te2IsNull = PG_ARGISNULL(3);
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/* Make sure we have ordered pairs... */
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if (ts1 > te1)
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#define TIMEADT_GT(t1,t2) \
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(DatumGetTimeADT(t1) > DatumGetTimeADT(t2))
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#define TIMEADT_LT(t1,t2) \
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(DatumGetTimeADT(t1) < DatumGetTimeADT(t2))
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/*
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* If both endpoints of interval 1 are null, the result is null (unknown).
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* If just one endpoint is null, take ts1 as the non-null one.
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* Otherwise, take ts1 as the lesser endpoint.
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*/
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if (ts1IsNull)
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{
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TimeADT tt = ts1;
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if (te1IsNull)
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PG_RETURN_NULL();
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/* swap null for non-null */
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ts1 = te1;
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te1 = tt;
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te1IsNull = true;
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}
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if (ts2 > te2)
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else if (!te1IsNull)
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{
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TimeADT tt = ts2;
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if (TIMEADT_GT(ts1, te1))
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{
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Datum tt = ts1;
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ts2 = te2;
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te2 = tt;
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ts1 = te1;
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te1 = tt;
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}
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}
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PG_RETURN_BOOL((ts1 > ts2 && (ts1 < te2 || te1 < te2)) ||
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(ts1 < ts2 && (ts2 < te1 || te2 < te1)) ||
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(ts1 == ts2));
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/* Likewise for interval 2. */
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if (ts2IsNull)
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{
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if (te2IsNull)
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PG_RETURN_NULL();
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/* swap null for non-null */
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ts2 = te2;
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te2IsNull = true;
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}
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else if (!te2IsNull)
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{
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if (TIMEADT_GT(ts2, te2))
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{
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Datum tt = ts2;
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ts2 = te2;
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te2 = tt;
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}
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}
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/*
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* At this point neither ts1 nor ts2 is null, so we can consider three
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* cases: ts1 > ts2, ts1 < ts2, ts1 = ts2
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*/
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if (TIMEADT_GT(ts1, ts2))
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{
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/* This case is ts1 < te2 OR te1 < te2, which may look redundant
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* but in the presence of nulls it's not quite completely so.
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*/
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if (te2IsNull)
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PG_RETURN_NULL();
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if (TIMEADT_LT(ts1, te2))
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PG_RETURN_BOOL(true);
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if (te1IsNull)
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PG_RETURN_NULL();
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/* If te1 is not null then we had ts1 <= te1 above, and we just
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* found ts1 >= te2, hence te1 >= te2.
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*/
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PG_RETURN_BOOL(false);
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}
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else if (TIMEADT_LT(ts1, ts2))
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{
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/* This case is ts2 < te1 OR te2 < te1 */
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if (te1IsNull)
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PG_RETURN_NULL();
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if (TIMEADT_LT(ts2, te1))
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PG_RETURN_BOOL(true);
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if (te2IsNull)
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PG_RETURN_NULL();
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/* If te2 is not null then we had ts2 <= te2 above, and we just
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* found ts2 >= te1, hence te2 >= te1.
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*/
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PG_RETURN_BOOL(false);
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}
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else
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{
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/* For ts1 = ts2 the spec says te1 <> te2 OR te1 = te2, which is a
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* rather silly way of saying "true if both are nonnull, else null".
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*/
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if (te1IsNull || te2IsNull)
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PG_RETURN_NULL();
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PG_RETURN_BOOL(true);
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}
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#undef TIMEADT_GT
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#undef TIMEADT_LT
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}
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/* timestamp_time()
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@ -964,53 +1049,122 @@ timetz_mi_interval(PG_FUNCTION_ARGS)
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PG_RETURN_TIMETZADT_P(result);
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}
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/* overlaps_timetz()
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* Implements the SQL92 OVERLAPS operator.
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* Algorithm from Date and Darwen, 1997
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/* overlaps_timetz() --- implements the SQL92 OVERLAPS operator.
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*
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* Algorithm is per SQL92 spec. This is much harder than you'd think
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* because the spec requires us to deliver a non-null answer in some cases
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* where some of the inputs are null.
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*/
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Datum
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overlaps_timetz(PG_FUNCTION_ARGS)
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{
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/* The arguments are TimeTzADT *, but we leave them as generic Datums
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* for convenience of notation.
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* for convenience of notation --- and to avoid dereferencing nulls.
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*/
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Datum ts1 = PG_GETARG_DATUM(0);
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Datum te1 = PG_GETARG_DATUM(1);
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Datum ts2 = PG_GETARG_DATUM(2);
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Datum te2 = PG_GETARG_DATUM(3);
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bool ts1IsNull = PG_ARGISNULL(0);
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bool te1IsNull = PG_ARGISNULL(1);
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bool ts2IsNull = PG_ARGISNULL(2);
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bool te2IsNull = PG_ARGISNULL(3);
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#define TIMETZ_GT(t1,t2) \
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DatumGetBool(DirectFunctionCall2(timetz_gt,t1,t2))
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#define TIMETZ_LT(t1,t2) \
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DatumGetBool(DirectFunctionCall2(timetz_lt,t1,t2))
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#define TIMETZ_EQ(t1,t2) \
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DatumGetBool(DirectFunctionCall2(timetz_eq,t1,t2))
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/* Make sure we have ordered pairs... */
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if (TIMETZ_GT(ts1, te1))
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/*
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* If both endpoints of interval 1 are null, the result is null (unknown).
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* If just one endpoint is null, take ts1 as the non-null one.
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* Otherwise, take ts1 as the lesser endpoint.
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*/
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if (ts1IsNull)
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{
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Datum tt = ts1;
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if (te1IsNull)
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PG_RETURN_NULL();
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/* swap null for non-null */
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ts1 = te1;
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te1 = tt;
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te1IsNull = true;
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}
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if (TIMETZ_GT(ts2, te2))
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else if (!te1IsNull)
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{
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Datum tt = ts2;
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if (TIMETZ_GT(ts1, te1))
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{
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Datum tt = ts1;
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ts2 = te2;
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te2 = tt;
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ts1 = te1;
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te1 = tt;
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}
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}
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PG_RETURN_BOOL((TIMETZ_GT(ts1, ts2) &&
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(TIMETZ_LT(ts1, te2) || TIMETZ_LT(te1, te2))) ||
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(TIMETZ_GT(ts2, ts1) &&
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(TIMETZ_LT(ts2, te1) || TIMETZ_LT(te2, te1))) ||
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TIMETZ_EQ(ts1, ts2));
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/* Likewise for interval 2. */
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if (ts2IsNull)
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{
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if (te2IsNull)
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PG_RETURN_NULL();
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/* swap null for non-null */
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ts2 = te2;
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te2IsNull = true;
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}
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else if (!te2IsNull)
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{
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if (TIMETZ_GT(ts2, te2))
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{
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Datum tt = ts2;
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ts2 = te2;
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te2 = tt;
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}
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}
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/*
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* At this point neither ts1 nor ts2 is null, so we can consider three
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* cases: ts1 > ts2, ts1 < ts2, ts1 = ts2
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*/
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if (TIMETZ_GT(ts1, ts2))
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{
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/* This case is ts1 < te2 OR te1 < te2, which may look redundant
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* but in the presence of nulls it's not quite completely so.
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*/
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if (te2IsNull)
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PG_RETURN_NULL();
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if (TIMETZ_LT(ts1, te2))
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PG_RETURN_BOOL(true);
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if (te1IsNull)
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PG_RETURN_NULL();
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/* If te1 is not null then we had ts1 <= te1 above, and we just
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* found ts1 >= te2, hence te1 >= te2.
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*/
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PG_RETURN_BOOL(false);
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}
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else if (TIMETZ_LT(ts1, ts2))
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{
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/* This case is ts2 < te1 OR te2 < te1 */
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if (te1IsNull)
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PG_RETURN_NULL();
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if (TIMETZ_LT(ts2, te1))
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PG_RETURN_BOOL(true);
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if (te2IsNull)
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PG_RETURN_NULL();
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/* If te2 is not null then we had ts2 <= te2 above, and we just
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* found ts2 >= te1, hence te2 >= te1.
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*/
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PG_RETURN_BOOL(false);
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}
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else
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{
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/* For ts1 = ts2 the spec says te1 <> te2 OR te1 = te2, which is a
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* rather silly way of saying "true if both are nonnull, else null".
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*/
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if (te1IsNull || te2IsNull)
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PG_RETURN_NULL();
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PG_RETURN_BOOL(true);
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}
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#undef TIMETZ_GT
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#undef TIMETZ_LT
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#undef TIMETZ_EQ
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}
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/* timestamp_timetz()
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/timestamp.c,v 1.39 2000/12/03 20:45:36 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/timestamp.c,v 1.40 2000/12/07 18:38:59 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -825,53 +825,123 @@ interval_hash(PG_FUNCTION_ARGS)
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return hash_any((char *) key, sizeof(double) + sizeof(int4));
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}
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/* overlaps_timestamp()
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* Implements the SQL92 OVERLAPS operator.
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* Algorithm from Date and Darwen, 1997
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/* overlaps_timestamp() --- implements the SQL92 OVERLAPS operator.
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*
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* Algorithm is per SQL92 spec. This is much harder than you'd think
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* because the spec requires us to deliver a non-null answer in some cases
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* where some of the inputs are null.
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*/
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Datum
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overlaps_timestamp(PG_FUNCTION_ARGS)
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{
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/* The arguments are Timestamps, but we leave them as generic Datums
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* to avoid unnecessary conversions between value and reference forms...
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* to avoid unnecessary conversions between value and reference forms
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* --- not to mention possible dereferences of null pointers.
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*/
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Datum ts1 = PG_GETARG_DATUM(0);
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Datum te1 = PG_GETARG_DATUM(1);
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Datum ts2 = PG_GETARG_DATUM(2);
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Datum te2 = PG_GETARG_DATUM(3);
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bool ts1IsNull = PG_ARGISNULL(0);
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bool te1IsNull = PG_ARGISNULL(1);
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bool ts2IsNull = PG_ARGISNULL(2);
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bool te2IsNull = PG_ARGISNULL(3);
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#define TIMESTAMP_GT(t1,t2) \
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DatumGetBool(DirectFunctionCall2(timestamp_gt,t1,t2))
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#define TIMESTAMP_LT(t1,t2) \
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DatumGetBool(DirectFunctionCall2(timestamp_lt,t1,t2))
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#define TIMESTAMP_EQ(t1,t2) \
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DatumGetBool(DirectFunctionCall2(timestamp_eq,t1,t2))
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/* Make sure we have ordered pairs... */
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if (TIMESTAMP_GT(ts1, te1))
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/*
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* If both endpoints of interval 1 are null, the result is null (unknown).
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* If just one endpoint is null, take ts1 as the non-null one.
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* Otherwise, take ts1 as the lesser endpoint.
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*/
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if (ts1IsNull)
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{
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Datum tt = ts1;
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|
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if (te1IsNull)
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PG_RETURN_NULL();
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/* swap null for non-null */
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ts1 = te1;
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te1 = tt;
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te1IsNull = true;
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}
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if (TIMESTAMP_GT(ts2, te2))
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else if (!te1IsNull)
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{
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Datum tt = ts2;
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if (TIMESTAMP_GT(ts1, te1))
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{
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Datum tt = ts1;
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ts2 = te2;
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te2 = tt;
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ts1 = te1;
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te1 = tt;
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}
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}
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PG_RETURN_BOOL((TIMESTAMP_GT(ts1, ts2) &&
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(TIMESTAMP_LT(ts1, te2) || TIMESTAMP_LT(te1, te2))) ||
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(TIMESTAMP_GT(ts2, ts1) &&
|
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(TIMESTAMP_LT(ts2, te1) || TIMESTAMP_LT(te2, te1))) ||
|
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TIMESTAMP_EQ(ts1, ts2));
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/* Likewise for interval 2. */
|
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if (ts2IsNull)
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{
|
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if (te2IsNull)
|
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PG_RETURN_NULL();
|
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/* swap null for non-null */
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ts2 = te2;
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te2IsNull = true;
|
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}
|
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else if (!te2IsNull)
|
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{
|
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if (TIMESTAMP_GT(ts2, te2))
|
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{
|
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Datum tt = ts2;
|
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|
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ts2 = te2;
|
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te2 = tt;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* At this point neither ts1 nor ts2 is null, so we can consider three
|
||||
* cases: ts1 > ts2, ts1 < ts2, ts1 = ts2
|
||||
*/
|
||||
if (TIMESTAMP_GT(ts1, ts2))
|
||||
{
|
||||
/* This case is ts1 < te2 OR te1 < te2, which may look redundant
|
||||
* but in the presence of nulls it's not quite completely so.
|
||||
*/
|
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if (te2IsNull)
|
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PG_RETURN_NULL();
|
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if (TIMESTAMP_LT(ts1, te2))
|
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PG_RETURN_BOOL(true);
|
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if (te1IsNull)
|
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PG_RETURN_NULL();
|
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/* If te1 is not null then we had ts1 <= te1 above, and we just
|
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* found ts1 >= te2, hence te1 >= te2.
|
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*/
|
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PG_RETURN_BOOL(false);
|
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}
|
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else if (TIMESTAMP_LT(ts1, ts2))
|
||||
{
|
||||
/* This case is ts2 < te1 OR te2 < te1 */
|
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if (te1IsNull)
|
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PG_RETURN_NULL();
|
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if (TIMESTAMP_LT(ts2, te1))
|
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PG_RETURN_BOOL(true);
|
||||
if (te2IsNull)
|
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PG_RETURN_NULL();
|
||||
/* If te2 is not null then we had ts2 <= te2 above, and we just
|
||||
* found ts2 >= te1, hence te2 >= te1.
|
||||
*/
|
||||
PG_RETURN_BOOL(false);
|
||||
}
|
||||
else
|
||||
{
|
||||
/* For ts1 = ts2 the spec says te1 <> te2 OR te1 = te2, which is a
|
||||
* rather silly way of saying "true if both are nonnull, else null".
|
||||
*/
|
||||
if (te1IsNull || te2IsNull)
|
||||
PG_RETURN_NULL();
|
||||
PG_RETURN_BOOL(true);
|
||||
}
|
||||
|
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#undef TIMESTAMP_GT
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#undef TIMESTAMP_LT
|
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#undef TIMESTAMP_EQ
|
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}
|
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|
||||
|
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|
|
|
|||
|
|
@ -7,7 +7,7 @@
|
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* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: pg_proc.h,v 1.176 2000/12/03 14:51:09 thomas Exp $
|
||||
* $Id: pg_proc.h,v 1.177 2000/12/07 18:38:58 tgl Exp $
|
||||
*
|
||||
* NOTES
|
||||
* The script catalog/genbki.sh reads this file and generates .bki
|
||||
|
|
@ -1510,7 +1510,7 @@ DESCR("absolute value");
|
|||
DATA(insert OID = 1263 ( interval PGUID 12 f t f t 1 f 1186 "25" 100 0 0 100 text_interval - ));
|
||||
DESCR("convert text to interval");
|
||||
|
||||
DATA(insert OID = 1271 ( overlaps PGUID 12 f t t t 4 f 16 "1266 1266 1266 1266" 100 0 0 100 overlaps_timetz - ));
|
||||
DATA(insert OID = 1271 ( overlaps PGUID 12 f t t f 4 f 16 "1266 1266 1266 1266" 100 0 0 100 overlaps_timetz - ));
|
||||
DESCR("SQL92 interval comparison");
|
||||
DATA(insert OID = 1272 ( datetime_pl PGUID 12 f t f t 2 f 1184 "1082 1083" 100 0 0 100 datetime_timestamp - ));
|
||||
DESCR("convert date and time to timestamp");
|
||||
|
|
@ -1569,22 +1569,22 @@ DESCR("restriction selectivity for containment comparison operators");
|
|||
DATA(insert OID = 1303 ( contjoinsel PGUID 12 f t f t 5 f 701 "26 26 21 26 21" 100 0 0 100 contjoinsel - ));
|
||||
DESCR("join selectivity for containment comparison operators");
|
||||
|
||||
DATA(insert OID = 1304 ( overlaps PGUID 12 f t t t 4 f 16 "1184 1184 1184 1184" 100 0 0 100 overlaps_timestamp - ));
|
||||
DATA(insert OID = 1304 ( overlaps PGUID 12 f t t f 4 f 16 "1184 1184 1184 1184" 100 0 0 100 overlaps_timestamp - ));
|
||||
DESCR("SQL92 interval comparison");
|
||||
DATA(insert OID = 1305 ( overlaps PGUID 14 f t t t 4 f 16 "1184 1186 1184 1186" 100 0 0 100 "select ($1, ($1 + $2)) overlaps ($3, ($3 + $4))" - ));
|
||||
DATA(insert OID = 1305 ( overlaps PGUID 14 f t t f 4 f 16 "1184 1186 1184 1186" 100 0 0 100 "select ($1, ($1 + $2)) overlaps ($3, ($3 + $4))" - ));
|
||||
DESCR("SQL92 interval comparison");
|
||||
DATA(insert OID = 1306 ( overlaps PGUID 14 f t t t 4 f 16 "1184 1184 1184 1186" 100 0 0 100 "select ($1, $2) overlaps ($3, ($3 + $4))" - ));
|
||||
DATA(insert OID = 1306 ( overlaps PGUID 14 f t t f 4 f 16 "1184 1184 1184 1186" 100 0 0 100 "select ($1, $2) overlaps ($3, ($3 + $4))" - ));
|
||||
DESCR("SQL92 interval comparison");
|
||||
DATA(insert OID = 1307 ( overlaps PGUID 14 f t t t 4 f 16 "1184 1186 1184 1184" 100 0 0 100 "select ($1, ($1 + $2)) overlaps ($3, $4)" - ));
|
||||
DATA(insert OID = 1307 ( overlaps PGUID 14 f t t f 4 f 16 "1184 1186 1184 1184" 100 0 0 100 "select ($1, ($1 + $2)) overlaps ($3, $4)" - ));
|
||||
DESCR("SQL92 interval comparison");
|
||||
|
||||
DATA(insert OID = 1308 ( overlaps PGUID 12 f t t t 4 f 16 "1083 1083 1083 1083" 100 0 0 100 overlaps_time - ));
|
||||
DATA(insert OID = 1308 ( overlaps PGUID 12 f t t f 4 f 16 "1083 1083 1083 1083" 100 0 0 100 overlaps_time - ));
|
||||
DESCR("SQL92 interval comparison");
|
||||
DATA(insert OID = 1309 ( overlaps PGUID 14 f t t t 4 f 16 "1083 1186 1083 1186" 100 0 0 100 "select ($1, ($1 + $2)) overlaps ($3, ($3 + $4))" - ));
|
||||
DATA(insert OID = 1309 ( overlaps PGUID 14 f t t f 4 f 16 "1083 1186 1083 1186" 100 0 0 100 "select ($1, ($1 + $2)) overlaps ($3, ($3 + $4))" - ));
|
||||
DESCR("SQL92 interval comparison");
|
||||
DATA(insert OID = 1310 ( overlaps PGUID 14 f t t t 4 f 16 "1083 1083 1083 1186" 100 0 0 100 "select ($1, $2) overlaps ($3, ($3 + $4))" - ));
|
||||
DATA(insert OID = 1310 ( overlaps PGUID 14 f t t f 4 f 16 "1083 1083 1083 1186" 100 0 0 100 "select ($1, $2) overlaps ($3, ($3 + $4))" - ));
|
||||
DESCR("SQL92 interval comparison");
|
||||
DATA(insert OID = 1311 ( overlaps PGUID 14 f t t t 4 f 16 "1083 1186 1083 1083" 100 0 0 100 "select ($1, ($1 + $2)) overlaps ($3, $4)" - ));
|
||||
DATA(insert OID = 1311 ( overlaps PGUID 14 f t t f 4 f 16 "1083 1186 1083 1083" 100 0 0 100 "select ($1, ($1 + $2)) overlaps ($3, $4)" - ));
|
||||
DESCR("SQL92 interval comparison");
|
||||
|
||||
DATA(insert OID = 1314 ( timestamp_cmp PGUID 12 f t f t 2 f 23 "1184 1184" 100 0 0 100 timestamp_cmp - ));
|
||||
|
|
|
|||
Loading…
Reference in New Issue