Add db-connect, a SQL over HTTPS server

vendor/github.com/kshvakov/clickhouse/lib/binary/compress_settings.go

@@ -0,0 +1,21 @@
+package binary
+
+type CompressionMethodByte byte
+
+const (
+	NONE CompressionMethodByte = 0x02
+	LZ4                        = 0x82
+	ZSTD                       = 0x90
+)
+
+const (
+	// ChecksumSize is 128bits for cityhash102 checksum
+	ChecksumSize = 16
+	// CompressHeader magic + compressed_size + uncompressed_size
+	CompressHeaderSize = 1 + 4 + 4
+
+	// HeaderSize
+	HeaderSize = ChecksumSize + CompressHeaderSize
+	// BlockMaxSize 1MB
+	BlockMaxSize = 1 << 10
+)