Package org.apache.calcite.sql.ddl
Class SqlKeyConstraint
- java.lang.Object
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- org.apache.calcite.sql.SqlNode
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- org.apache.calcite.sql.SqlCall
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- org.apache.calcite.sql.ddl.SqlKeyConstraint
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- All Implemented Interfaces:
java.lang.Cloneable
public class SqlKeyConstraint extends SqlCall
Parse tree forUNIQUE
,PRIMARY KEY
constraints.And
FOREIGN KEY
, when we support it.
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Field Summary
Fields Modifier and Type Field Description private SqlNodeList
columnList
private SqlIdentifier
name
protected static SqlSpecialOperator
PRIMARY
private static SqlSpecialOperator
UNIQUE
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Fields inherited from class org.apache.calcite.sql.SqlNode
EMPTY_ARRAY, pos
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Constructor Summary
Constructors Constructor Description SqlKeyConstraint(SqlParserPos pos, SqlIdentifier name, SqlNodeList columnList)
Creates a SqlKeyConstraint.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description java.util.List<SqlNode>
getOperandList()
SqlOperator
getOperator()
static SqlKeyConstraint
primary(SqlParserPos pos, SqlIdentifier name, SqlNodeList columnList)
Creates a PRIMARY KEY constraint.static SqlKeyConstraint
unique(SqlParserPos pos, SqlIdentifier name, SqlNodeList columnList)
Creates a UNIQUE constraint.void
unparse(SqlWriter writer, int leftPrec, int rightPrec)
Writes a SQL representation of this node to a writer.-
Methods inherited from class org.apache.calcite.sql.SqlCall
accept, clone, equalsDeep, findValidOptions, getCallSignature, getFunctionQuantifier, getKind, getMonotonicity, isCountStar, isExpanded, operand, operandCount, setOperand, validate
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Methods inherited from class org.apache.calcite.sql.SqlNode
clone, clone, cloneArray, equalDeep, equalDeep, equalsDeep, getParserPosition, isA, toSqlString, toSqlString, toString, validateExpr
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Field Detail
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UNIQUE
private static final SqlSpecialOperator UNIQUE
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PRIMARY
protected static final SqlSpecialOperator PRIMARY
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name
private final SqlIdentifier name
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columnList
private final SqlNodeList columnList
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Constructor Detail
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SqlKeyConstraint
SqlKeyConstraint(SqlParserPos pos, SqlIdentifier name, SqlNodeList columnList)
Creates a SqlKeyConstraint.
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Method Detail
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unique
public static SqlKeyConstraint unique(SqlParserPos pos, SqlIdentifier name, SqlNodeList columnList)
Creates a UNIQUE constraint.
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primary
public static SqlKeyConstraint primary(SqlParserPos pos, SqlIdentifier name, SqlNodeList columnList)
Creates a PRIMARY KEY constraint.
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getOperator
public SqlOperator getOperator()
- Specified by:
getOperator
in classSqlCall
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getOperandList
public java.util.List<SqlNode> getOperandList()
- Specified by:
getOperandList
in classSqlCall
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unparse
public void unparse(SqlWriter writer, int leftPrec, int rightPrec)
Description copied from class:SqlNode
Writes a SQL representation of this node to a writer.The
leftPrec
andrightPrec
parameters give us enough context to decide whether we need to enclose the expression in parentheses. For example, we need parentheses around "2 + 3" if preceded by "5 *". This is because the precedence of the "*" operator is greater than the precedence of the "+" operator.The algorithm handles left- and right-associative operators by giving them slightly different left- and right-precedence.
If
SqlWriter.isAlwaysUseParentheses()
is true, we use parentheses even when they are not required by the precedence rules.For the details of this algorithm, see
SqlCall.unparse(org.apache.calcite.sql.SqlWriter, int, int)
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