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bindinfo: refacter the matcher (#50362)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| load("@io_bazel_rules_go//go:def.bzl", "go_library") | ||
|
|
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| go_library( | ||
| name = "norm", | ||
| srcs = ["normalize.go"], | ||
| importpath = "github.com/pingcap/tidb/pkg/bindinfo/norm", | ||
| visibility = ["//visibility:public"], | ||
| deps = [ | ||
| "//pkg/parser", | ||
| "//pkg/parser/ast", | ||
| "//pkg/util/parser", | ||
| ], | ||
| ) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| // Copyright 2023 PingCAP, 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. | ||
|
|
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| package norm | ||
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| import ( | ||
| "strings" | ||
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| "github.com/pingcap/tidb/pkg/parser" | ||
| "github.com/pingcap/tidb/pkg/parser/ast" | ||
| utilparser "github.com/pingcap/tidb/pkg/util/parser" | ||
| ) | ||
|
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| type option struct { | ||
| specifiedDB string | ||
| fuzz bool | ||
| } | ||
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| type optionFunc func(*option) | ||
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| // WithFuzz specifies whether to eliminate schema names. | ||
| func WithFuzz(fuzz bool) optionFunc { | ||
| return func(user *option) { | ||
| user.fuzz = fuzz | ||
| } | ||
| } | ||
|
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| // WithSpecifiedDB specifies the specified DB name. | ||
| func WithSpecifiedDB(specifiedDB string) optionFunc { | ||
| return func(user *option) { | ||
| user.specifiedDB = specifiedDB | ||
| } | ||
| } | ||
|
|
||
| // NormalizeStmtForBinding normalizes a statement for binding. | ||
| // when fuzz is false, schema names will be completed automatically: `select * from t` --> `select * from db . t`. | ||
| // when fuzz is true, schema names will be eliminated automatically: `select * from db . t` --> `select * from t`. | ||
| func NormalizeStmtForBinding(stmtNode ast.StmtNode, options ...optionFunc) (normalizedStmt, exactSQLDigest string) { | ||
| opt := &option{} | ||
| for _, option := range options { | ||
| option(opt) | ||
| } | ||
| return normalizeStmt(stmtNode, opt.specifiedDB, opt.fuzz) | ||
| } | ||
|
|
||
| // NormalizeStmtForBinding normalizes a statement for binding. | ||
| // This function skips Explain automatically, and literals in in-lists will be normalized as '...'. | ||
| // For normal bindings, DB name will be completed automatically: | ||
| // | ||
| // e.g. `select * from t where a in (1, 2, 3)` --> `select * from test.t where a in (...)` | ||
| func normalizeStmt(stmtNode ast.StmtNode, specifiedDB string, fuzzy bool) (normalizedStmt, sqlDigest string) { | ||
| normalize := func(n ast.StmtNode) (normalizedStmt, sqlDigest string) { | ||
| eraseLastSemicolon(n) | ||
| var digest *parser.Digest | ||
| var normalizedSQL string | ||
| if !fuzzy { | ||
| normalizedSQL = utilparser.RestoreWithDefaultDB(n, specifiedDB, n.Text()) | ||
| } else { | ||
| normalizedSQL = utilparser.RestoreWithoutDB(n) | ||
| } | ||
| normalizedStmt, digest = parser.NormalizeDigestForBinding(normalizedSQL) | ||
| return normalizedStmt, digest.String() | ||
| } | ||
|
|
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| switch x := stmtNode.(type) { | ||
| case *ast.ExplainStmt: | ||
| // This function is only used to find bind record. | ||
| // For some SQLs, such as `explain select * from t`, they will be entered here many times, | ||
| // but some of them do not want to obtain bind record. | ||
| // The difference between them is whether len(x.Text()) is empty. They cannot be distinguished by stmt.restore. | ||
| // For these cases, we need return "" as normalize SQL and hash. | ||
| if len(x.Text()) == 0 { | ||
| return "", "" | ||
| } | ||
| switch x.Stmt.(type) { | ||
| case *ast.SelectStmt, *ast.DeleteStmt, *ast.UpdateStmt, *ast.InsertStmt: | ||
| normalizeSQL, digest := normalize(x.Stmt) | ||
| return normalizeSQL, digest | ||
| case *ast.SetOprStmt: | ||
| normalizeExplainSQL, _ := normalize(x) | ||
|
|
||
| idx := strings.Index(normalizeExplainSQL, "select") | ||
| parenthesesIdx := strings.Index(normalizeExplainSQL, "(") | ||
| if parenthesesIdx != -1 && parenthesesIdx < idx { | ||
| idx = parenthesesIdx | ||
| } | ||
| // If the SQL is `EXPLAIN ((VALUES ROW ()) ORDER BY 1);`, the idx will be -1. | ||
| if idx == -1 { | ||
| hash := parser.DigestNormalized(normalizeExplainSQL) | ||
| return normalizeExplainSQL, hash.String() | ||
| } | ||
| normalizeSQL := normalizeExplainSQL[idx:] | ||
| hash := parser.DigestNormalized(normalizeSQL) | ||
| return normalizeSQL, hash.String() | ||
| } | ||
| case *ast.SelectStmt, *ast.SetOprStmt, *ast.DeleteStmt, *ast.UpdateStmt, *ast.InsertStmt: | ||
| // This function is only used to find bind record. | ||
| // For some SQLs, such as `explain select * from t`, they will be entered here many times, | ||
| // but some of them do not want to obtain bind record. | ||
| // The difference between them is whether len(x.Text()) is empty. They cannot be distinguished by stmt.restore. | ||
| // For these cases, we need return "" as normalize SQL and hash. | ||
| if len(x.Text()) == 0 { | ||
| return "", "" | ||
| } | ||
| normalizedSQL, digest := normalize(x) | ||
| return normalizedSQL, digest | ||
| } | ||
| return "", "" | ||
| } | ||
|
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| func eraseLastSemicolon(stmt ast.StmtNode) { | ||
| sql := stmt.Text() | ||
| if len(sql) > 0 && sql[len(sql)-1] == ';' { | ||
| stmt.SetText(nil, sql[:len(sql)-1]) | ||
| } | ||
| } |
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