github.com/matrixorigin/matrixone@v1.2.0/pkg/sql/plan/const.go (about)

     1  // Copyright 2023 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 plan
    16  
    17  const (
    18  	/*
    19  		https://dev.mysql.com/doc/refman/8.0/en/column-count-limit.html
    20  		MySQL has hard limit of 4096 columns per table, but the effective maximum may be less for a given table.
    21  	*/
    22  	TableColumnCountLimit = 4096
    23  )
    24  
    25  const (
    26  	/*
    27  		Identifier Length Limits
    28  		See MySQL: https://dev.mysql.com/doc/refman/8.0/en/identifiers.html
    29  	*/
    30  	// MaxKeyParts is max length of key parts.
    31  	MaxKeyParts = 16
    32  )
    33  
    34  const (
    35  	// PrimaryKeyName defines primary key name.
    36  	PrimaryKeyName = "PRIMARY"
    37  )