*: added pre-commit hook.

Makefile

@@ -24,9 +24,9 @@ LDFLAGS += -X "github.com/pingcap/tidb/util/printer.TiDBGitHash=$(shell git rev-
 
 TARGET = ""
 
-.PHONY: all build update parser clean todo test gotest interpreter server dev benchkv benchraw check parserlib
+.PHONY: all build update parser clean todo test gotest interpreter server dev benchkv benchraw check parserlib precommithook
 
-default: server buildsucc
+default: server buildsucc precommithook
 
 buildsucc:
 	@echo Build TiDB Server successfully!
@@ -140,3 +140,7 @@ endif
 	glide vc --only-code --no-tests
 	mkdir -p _vendor
 	mv vendor _vendor/src
+
+precommithook:
+	ln -s hooks/pre-commit .git/hooks/
+	chmod +x .git/hooks/pre-commit

hooks/pre-commit

@@ -1,4 +1,11 @@
 #!/bin/bash
+# This file modified from k8s
+# https://github.com/kubernetes/kubernetes/blob/master/hooks/pre-commit
+
+# How to use this hook?
+# ln -s hooks/pre-commit .git/hooks/
+# In case hook is not executable
+# chmod +x .git/hooks/pre-commit
 
 readonly reset=$(tput sgr0)
 readonly red=$(tput bold; tput setaf 1)

plan/decorrelate.go

@@ -23,7 +23,7 @@ import (
 
 // extractCorColumnsBySchema only extracts the correlated columns that match the outer plan's schema.
 // e.g. If the correlated columns from inner plan are [t1.a, t2.a, t3.a] and outer plan's schema is [t2.a, t2.b, t2.c],
-// only [t2.a] is treated as this apply's correlated column.
+// only [t2.a] is treated as this applies correlated column.
 func (a *LogicalApply) extractCorColumnsBySchema() {
 	schema := a.children[0].Schema()
 	corCols := a.children[1].(LogicalPlan).extractCorrelatedCols()