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Pulling the GenerateSqlPatchSchemaStatements into the sqlfmt package …
…(and cleaning up pkg import cycles)
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109 changes: 109 additions & 0 deletions
109
go/libraries/doltcore/sqle/expranalysis/expranalysis.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| // Copyright 2024 Dolthub, Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package expranalysis | ||
|
|
||
| import ( | ||
| "fmt" | ||
|
|
||
| "github.com/dolthub/go-mysql-server/memory" | ||
| "github.com/dolthub/go-mysql-server/sql" | ||
| "github.com/dolthub/go-mysql-server/sql/analyzer" | ||
| "github.com/dolthub/go-mysql-server/sql/expression" | ||
| "github.com/dolthub/go-mysql-server/sql/plan" | ||
| "github.com/dolthub/go-mysql-server/sql/planbuilder" | ||
| "github.com/dolthub/go-mysql-server/sql/transform" | ||
|
|
||
| "github.com/dolthub/dolt/go/libraries/doltcore/schema" | ||
| "github.com/dolthub/dolt/go/libraries/doltcore/sqle/sqlfmt" | ||
| ) | ||
|
|
||
| // ResolveDefaultExpression returns a sql.Expression for the column default or generated expression for the | ||
| // column provided | ||
| func ResolveDefaultExpression(ctx *sql.Context, tableName string, sch schema.Schema, col schema.Column) (sql.Expression, error) { | ||
| ct, err := parseCreateTable(ctx, tableName, sch) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| colIdx := ct.PkSchema().Schema.IndexOfColName(col.Name) | ||
| if colIdx < 0 { | ||
| return nil, fmt.Errorf("unable to find column %s in analyzed query", col.Name) | ||
| } | ||
|
|
||
| sqlCol := ct.PkSchema().Schema[colIdx] | ||
| expr := sqlCol.Default | ||
| if expr == nil || expr.Expr == nil { | ||
| expr = sqlCol.Generated | ||
| } | ||
|
|
||
| if expr == nil || expr.Expr == nil { | ||
| return nil, fmt.Errorf("unable to find default or generated expression") | ||
| } | ||
|
|
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| return expr.Expr, nil | ||
| } | ||
|
|
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| // ResolveCheckExpression returns a sql.Expression for the check provided | ||
| func ResolveCheckExpression(ctx *sql.Context, tableName string, sch schema.Schema, checkExpr string) (sql.Expression, error) { | ||
| ct, err := parseCreateTable(ctx, tableName, sch) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
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| for _, check := range ct.Checks() { | ||
| if stripTableNamesFromExpression(check.Expr).String() == checkExpr { | ||
| return check.Expr, nil | ||
| } | ||
| } | ||
|
|
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| return nil, fmt.Errorf("unable to find check expression") | ||
| } | ||
|
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| func stripTableNamesFromExpression(expr sql.Expression) sql.Expression { | ||
| e, _, _ := transform.Expr(expr, func(e sql.Expression) (sql.Expression, transform.TreeIdentity, error) { | ||
| if col, ok := e.(*expression.GetField); ok { | ||
| return col.WithTable(""), transform.NewTree, nil | ||
| } | ||
| return e, transform.SameTree, nil | ||
| }) | ||
| return e | ||
| } | ||
|
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| func parseCreateTable(ctx *sql.Context, tableName string, sch schema.Schema) (*plan.CreateTable, error) { | ||
| createTable, err := sqlfmt.GenerateCreateTableStatement(tableName, sch, nil, nil) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| query := createTable | ||
|
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| mockDatabase := memory.NewDatabase("mydb") | ||
| mockProvider := memory.NewDBProvider(mockDatabase) | ||
| catalog := analyzer.NewCatalog(mockProvider) | ||
| parseCtx := sql.NewEmptyContext() | ||
| parseCtx.SetCurrentDatabase("mydb") | ||
|
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||
| b := planbuilder.New(parseCtx, catalog, sql.NewMysqlParser()) | ||
| pseudoAnalyzedQuery, _, _, err := b.Parse(query, false) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| ct, ok := pseudoAnalyzedQuery.(*plan.CreateTable) | ||
| if !ok { | ||
| return nil, fmt.Errorf("expected a *plan.CreateTable node, but got %T", pseudoAnalyzedQuery) | ||
| } | ||
| return ct, nil | ||
| } |
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