Package org.h2.expression
Class ConcatenationOperation
- java.lang.Object
-
- org.h2.expression.Expression
-
- org.h2.expression.OperationN
-
- org.h2.expression.ConcatenationOperation
-
- All Implemented Interfaces:
ExpressionWithVariableParameters
,HasSQL
,Typed
public final class ConcatenationOperation extends OperationN
Character string concatenation as in'Hello' || 'World'
, binary string concatenation as inX'01' || X'AB'
or an array concatenation as inARRAY[1, 2] || 3
.
-
-
Field Summary
-
Fields inherited from class org.h2.expression.OperationN
args, argsCount, type
-
Fields inherited from class org.h2.expression.Expression
AUTO_PARENTHESES, MAP_IN_AGGREGATE, MAP_IN_WINDOW, MAP_INITIAL, WITH_PARENTHESES, WITHOUT_PARENTHESES
-
Fields inherited from interface org.h2.util.HasSQL
ADD_PLAN_INFORMATION, DEFAULT_SQL_FLAGS, NO_CASTS, QUOTE_ONLY_WHEN_REQUIRED, REPLACE_LOBS_FOR_TRACE, TRACE_SQL_FLAGS
-
-
Constructor Summary
Constructors Constructor Description ConcatenationOperation()
ConcatenationOperation(Expression op1, Expression op2)
-
Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description private void
determineType(SessionLocal session)
private long
getPrecision(int i)
java.lang.StringBuilder
getUnenclosedSQL(java.lang.StringBuilder builder, int sqlFlags)
Get the SQL statement of this expression.Value
getValue(SessionLocal session)
Return the resulting value for the current row.private Value
getValue(SessionLocal session, int l)
private Value
getValue(SessionLocal session, Value l, Value r)
private void
inlineArguments()
private static boolean
isEmpty(Value v)
boolean
needParentheses()
Returns whether this expressions needs to be wrapped in parentheses when it is used as an argument of other expressions.Expression
optimize(SessionLocal session)
Try to optimize the expression.-
Methods inherited from class org.h2.expression.OperationN
addParameter, doneWithParameters, getCost, getSubexpression, getSubexpressionCount, getType, isEverything, mapColumns, optimizeArguments, setEvaluatable, updateAggregate
-
Methods inherited from class org.h2.expression.Expression
addFilterConditions, createIndexConditions, getAlias, getBooleanValue, getColumnName, getColumnNameForView, getEnclosedSQL, getNonAliasExpression, getNotIfPossible, getNullable, getSchemaName, getSQL, getSQL, getSQL, getSQL, getTableAlias, getTableName, getWhenSQL, getWhenValue, isConstant, isIdentity, isNullConstant, isValueSet, isWhenConditionOperand, optimizeCondition, toString, writeExpressions, writeExpressions
-
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
-
Methods inherited from interface org.h2.util.HasSQL
getTraceSQL
-
-
-
-
Constructor Detail
-
ConcatenationOperation
public ConcatenationOperation()
-
ConcatenationOperation
public ConcatenationOperation(Expression op1, Expression op2)
-
-
Method Detail
-
needParentheses
public boolean needParentheses()
Description copied from class:Expression
Returns whether this expressions needs to be wrapped in parentheses when it is used as an argument of other expressions.- Overrides:
needParentheses
in classExpression
- Returns:
true
if it is
-
getUnenclosedSQL
public java.lang.StringBuilder getUnenclosedSQL(java.lang.StringBuilder builder, int sqlFlags)
Description copied from class:Expression
Get the SQL statement of this expression. This may not always be the original SQL statement, especially after optimization. Enclosing '(' and ')' are never appended.- Specified by:
getUnenclosedSQL
in classExpression
- Parameters:
builder
- string buildersqlFlags
- formatting flags- Returns:
- the specified string builder
-
getValue
public Value getValue(SessionLocal session)
Description copied from class:Expression
Return the resulting value for the current row.- Specified by:
getValue
in classExpression
- Parameters:
session
- the session- Returns:
- the result
-
getValue
private Value getValue(SessionLocal session, Value l, Value r)
-
getValue
private Value getValue(SessionLocal session, int l)
-
optimize
public Expression optimize(SessionLocal session)
Description copied from class:Expression
Try to optimize the expression.- Specified by:
optimize
in classExpression
- Parameters:
session
- the session- Returns:
- the optimized expression
-
determineType
private void determineType(SessionLocal session)
-
getPrecision
private long getPrecision(int i)
-
inlineArguments
private void inlineArguments()
-
isEmpty
private static boolean isEmpty(Value v)
-
-