public static enum RelOptUtil.Logic extends java.lang.Enum<RelOptUtil.Logic>
Enum Constant and Description |
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FALSE
An anti-semi-join will have been applied, so that only rows for which
the value is FALSE will have been returned.
|
TRUE
A semi-join will have been applied, so that only rows for which the
value is TRUE will have been returned.
|
TRUE_FALSE
Nulls are not possible.
|
TRUE_FALSE_UNKNOWN
Three-valued boolean logic.
|
UNKNOWN_AS_FALSE
Two-valued logic where UNKNOWN is treated as FALSE.
|
UNKNOWN_AS_TRUE
Two-valued logic where UNKNOWN is treated as TRUE.
|
Modifier and Type | Method and Description |
---|---|
RelOptUtil.Logic |
negate() |
RelOptUtil.Logic |
negate2()
Variant of
negate() to be used within LogicVisitor ,
where FALSE values may exist. |
static RelOptUtil.Logic |
valueOf(java.lang.String name)
Returns the enum constant of this type with the specified name.
|
static RelOptUtil.Logic[] |
values()
Returns an array containing the constants of this enum type, in
the order they are declared.
|
public static final RelOptUtil.Logic TRUE_FALSE_UNKNOWN
public static final RelOptUtil.Logic TRUE_FALSE
public static final RelOptUtil.Logic UNKNOWN_AS_FALSE
"x IS TRUE" produces the same result, and "WHERE x", "JOIN ... ON x" and "HAVING x" have the same effect.
public static final RelOptUtil.Logic UNKNOWN_AS_TRUE
"x IS FALSE" produces the same result, as does "WHERE NOT x", etc.
In particular, this is the mode used by "WHERE k NOT IN q". If "k IN q" produces TRUE or UNKNOWN, "NOT k IN q" produces FALSE or UNKNOWN and the row is eliminated; if "k IN q" it returns FALSE, the row is retained by the WHERE clause.
public static final RelOptUtil.Logic TRUE
public static final RelOptUtil.Logic FALSE
Currently only used within LogicVisitor
, to ensure that
'NOT (NOT EXISTS (q))' behaves the same as 'EXISTS (q)')
public static RelOptUtil.Logic[] values()
for (RelOptUtil.Logic c : RelOptUtil.Logic.values()) System.out.println(c);
public static RelOptUtil.Logic valueOf(java.lang.String name)
name
- the name of the enum constant to be returned.java.lang.IllegalArgumentException
- if this enum type has no constant with the specified namejava.lang.NullPointerException
- if the argument is nullpublic RelOptUtil.Logic negate()
public RelOptUtil.Logic negate2()
negate()
to be used within LogicVisitor
,
where FALSE values may exist.Copyright © 2012–2019 The Apache Software Foundation. All rights reserved.