Support empty double-quoted string in SQL object body #16821

Job	Run time
Generate Version Upgrade Tests	5s
Run Version Upgrade Test for 13_6-14_6-target_latest	33m 19s
Run Version Upgrade Test for 13_9-14_6-target_latest	33m 10s
Run Version Upgrade Test for 14_3-14_6-target_latest	34m 58s
Run Version Upgrade Test for source_latest-target_latest	39m 18s
Run Version Upgrade Test for 14_5-14_6-target_latest	32m 58s
Run Version Upgrade Test for 14_6-target_latest	31m 15s
Run Version Upgrade Test for 14_12-target_latest	30m 50s
Run Version Upgrade Test for 14_15-target_latest	30m 29s
Run Version Upgrade Test for 15_2-target_latest	30m 19s
Run Version Upgrade Test for 15_9-target_latest	34m 6s
Run Version Upgrade Test for 16_1-target_latest	32m 47s
Run Version Upgrade Test for 16_2-target_latest	38m 15s
Run Version Upgrade Test for 16_5-target_latest	30m 57s
Run Version Upgrade Test for 13_6-14_15-15_10-target_latest with server-collation - chinese_prc_ci_as	36m 39s
Run Version Upgrade Test for 14_6-target_latest with server-collation - chinese_prc_ci_as	29m 22s
Run Version Upgrade Test for 15_10-target_latest with server-collation - chinese_prc_ci_as	34m 58s
Run Version Upgrade Test for 15_10-target_latest with server-collation - japanese_ci_as	31m 34s
Run Version Upgrade Test for 15_5-15_10-target_latest with server-collation - chinese_prc_ci_as	37m 54s
Run Version Upgrade Test for 16_1-target_latest with server-collation - chinese_prc_ci_as	31m 30s
	10h 34m 43s

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