github.com/matrixorigin/matrixone@v1.2.0/pkg/sql/parsers/tree/values.go (about)

     1  // Copyright 2021 Matrix Origin
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package tree
    16  
    17  // the VALUES clause
    18  type ValuesClause struct {
    19  	SelectStatement
    20  	RowWord bool
    21  	Rows    []Exprs
    22  }
    23  
    24  func (node *ValuesClause) Format(ctx *FmtCtx) {
    25  	ctx.WriteString("values ")
    26  	comma := ""
    27  	for i := range node.Rows {
    28  		ctx.WriteString(comma)
    29  		if node.RowWord {
    30  			ctx.WriteString("row")
    31  		}
    32  		ctx.WriteByte('(')
    33  		node.Rows[i].Format(ctx)
    34  		ctx.WriteByte(')')
    35  		comma = ", "
    36  	}
    37  }
    38  
    39  func NewValuesClause(r []Exprs) *ValuesClause {
    40  	return &ValuesClause{
    41  		Rows: r,
    42  	}
    43  }
    44  
    45  // ValuesStatement the VALUES Statement
    46  type ValuesStatement struct {
    47  	statementImpl
    48  	NodeFormatter
    49  	Rows    []Exprs
    50  	OrderBy OrderBy
    51  	Limit   *Limit
    52  }
    53  
    54  func (node *ValuesStatement) Format(ctx *FmtCtx) {
    55  	ctx.WriteString("values ")
    56  
    57  	if len(node.Rows) > 0 {
    58  		prefix := ""
    59  		for _, row := range node.Rows {
    60  			ctx.WriteString(prefix + "row(")
    61  			comma := ""
    62  			for i := range row {
    63  				ctx.WriteString(comma)
    64  				row[i].Format(ctx)
    65  				comma = ", "
    66  			}
    67  			prefix = "), "
    68  		}
    69  		ctx.WriteString(")")
    70  	}
    71  
    72  	if len(node.OrderBy) > 0 {
    73  		ctx.WriteByte(' ')
    74  		node.OrderBy.Format(ctx)
    75  	}
    76  	if node.Limit != nil {
    77  		ctx.WriteByte(' ')
    78  		node.Limit.Format(ctx)
    79  	}
    80  }
    81  func (node *ValuesStatement) GetStatementType() string { return "Values" }
    82  func (node *ValuesStatement) GetQueryType() string     { return QueryTypeDQL }