Package org.apache.calcite.sql
Class SqlDescribeSchema
- 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.SqlDescribeSchema
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- All Implemented Interfaces:
java.lang.Cloneable
public class SqlDescribeSchema extends SqlCall
ASqlDescribeSchema
is a node of a parse tree that represents aDESCRIBE SCHEMA
statement.
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Field Summary
Fields Modifier and Type Field Description static SqlSpecialOperator
OPERATOR
(package private) SqlIdentifier
schema
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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 SqlDescribeSchema(SqlParserPos pos, SqlIdentifier schema)
Creates a SqlDescribeSchema.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.util.List<SqlNode>
getOperandList()
SqlOperator
getOperator()
SqlIdentifier
getSchema()
void
setOperand(int i, SqlNode operand)
Changes the value of an operand.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, 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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OPERATOR
public static final SqlSpecialOperator OPERATOR
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schema
SqlIdentifier schema
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Constructor Detail
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SqlDescribeSchema
public SqlDescribeSchema(SqlParserPos pos, SqlIdentifier schema)
Creates a SqlDescribeSchema.
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Method Detail
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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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setOperand
public void setOperand(int i, SqlNode operand)
Description copied from class:SqlCall
Changes the value of an operand. Allows some rewrite bySqlValidator
; use sparingly.- Overrides:
setOperand
in classSqlCall
- Parameters:
i
- Operand indexoperand
- Operand value
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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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getSchema
public SqlIdentifier getSchema()
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