Remove end-of-life MySQL 5.5.x version

.github/workflows/replica-tests.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        version: [mysql-5.5.62,mysql-5.6.43,mysql-5.7.25,mysql-8.0.16]
+        version: [mysql-5.6.43,mysql-5.7.25,mysql-8.0.16]
 
     steps:
     - uses: actions/checkout@v2

doc/requirements-and-limitations.md

@@ -2,6 +2,8 @@
 
 ### Requirements
 
+- `gh-ost` currently requires MySQL versions 5.6 and greater.
+
 - You will need to have one server serving Row Based Replication (RBR) format binary logs. Right now `FULL` row image is supported. `MINIMAL` to be supported in the near future. `gh-ost` prefers to work with replicas. You may [still have your master configured with Statement Based Replication](migrating-with-sbr.md) (SBR).
 
 - If you are using a replica, the table must have an identical schema between the master and replica.

go/logic/inspect.go

@@ -364,8 +364,7 @@ func (this *Inspector) validateBinlogs() error {
 	}
 	query = `select @@global.binlog_row_image`
 	if err := this.db.QueryRow(query).Scan(&this.migrationContext.OriginalBinlogRowImage); err != nil {
-		// Only as of 5.6. We wish to support 5.5 as well
-		this.migrationContext.OriginalBinlogRowImage = "FULL"
+		return err
 	}
 	this.migrationContext.OriginalBinlogRowImage = strings.ToUpper(this.migrationContext.OriginalBinlogRowImage)
 	if this.migrationContext.OriginalBinlogRowImage != "FULL" {

localtests/generated-columns-add57/ignore_versions

@@ -1 +1 @@
-(5.5|5.6)
+(5.6)

localtests/generated-columns-rename57/ignore_versions

@@ -1 +1 @@
-(5.5|5.6)
+(5.6)

localtests/generated-columns57-unique/ignore_versions

@@ -1 +1 @@
-(5.5|5.6)
+(5.6)

localtests/generated-columns57/ignore_versions

@@ -1 +1 @@
-(5.5|5.6)
+(5.6)

localtests/geometry57/ignore_versions

@@ -1 +1 @@
-(5.5|5.6)
+(5.6)

localtests/json57/ignore_versions

@@ -1 +1 @@
-(5.5|5.6)
+(5.6)

localtests/json57dml/ignore_versions

@@ -1 +1 @@
-(5.5|5.6)
+(5.6)

localtests/spatial57/ignore_versions

@@ -1 +1 @@
-(5.5|5.6)
+(5.6)