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Support for SSSSS datetime format pattern

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SQL Standard 2016 defines SSSSS format pattern for seconds past midnight in
jsonpath .datetime() method and CAST (... FORMAT ...) SQL clause.  In our
datetime parsing engine we currently support it with SSSS name.

This commit adds SSSSS as an alias for SSSS.  Alias is added in favor of
upcoming jsonpath .datetime() method.  But it's also supported in to_date()/
to_timestamp() as positive side effect.

Discussion: https://postgr.es/m/CAPpHfdsZgYEra_PeCLGNoXOWYx6iU-S3wF8aX0ObQUcZU%2B4XTw%40mail.gmail.com
Author: Nikita Glukhov, Alexander Korotkov
Reviewed-by: Anastasia Lubennikova, Peter Eisentraut
This commit is contained in:
Alexander Korotkov
2019-09-16 21:02:32 +03:00
parent d589f94460
commit b64b857f50
4 changed files with 33 additions and 5 deletions
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12
src/backend/utils/adt/formatting.c
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@ -626,6 +626,7 @@ typedef enum
DCH_PM,
DCH_Q,
DCH_RM,
DCH_SSSSS,
DCH_SSSS,
DCH_SS,
DCH_TZH,
@ -678,6 +679,7 @@ typedef enum
DCH_pm,
DCH_q,
DCH_rm,
DCH_sssss,
DCH_ssss,
DCH_ss,
DCH_tz,
@ -787,7 +789,8 @@ static const KeyWord DCH_keywords[] = {
{"PM", 2, DCH_PM, false, FROM_CHAR_DATE_NONE},
{"Q", 1, DCH_Q, true, FROM_CHAR_DATE_NONE}, /* Q */
{"RM", 2, DCH_RM, false, FROM_CHAR_DATE_GREGORIAN}, /* R */
{"SSSS", 4, DCH_SSSS, true, FROM_CHAR_DATE_NONE}, /* S */
{"SSSSS", 5, DCH_SSSS, true, FROM_CHAR_DATE_NONE}, /* S */
{"SSSS", 4, DCH_SSSS, true, FROM_CHAR_DATE_NONE},
{"SS", 2, DCH_SS, true, FROM_CHAR_DATE_NONE},
{"TZH", 3, DCH_TZH, false, FROM_CHAR_DATE_NONE}, /* T */
{"TZM", 3, DCH_TZM, true, FROM_CHAR_DATE_NONE},
@ -839,7 +842,8 @@ static const KeyWord DCH_keywords[] = {
{"pm", 2, DCH_pm, false, FROM_CHAR_DATE_NONE},
{"q", 1, DCH_Q, true, FROM_CHAR_DATE_NONE}, /* q */
{"rm", 2, DCH_rm, false, FROM_CHAR_DATE_GREGORIAN}, /* r */
{"ssss", 4, DCH_SSSS, true, FROM_CHAR_DATE_NONE}, /* s */
{"sssss", 5, DCH_SSSS, true, FROM_CHAR_DATE_NONE}, /* s */
{"ssss", 4, DCH_SSSS, true, FROM_CHAR_DATE_NONE},
{"ss", 2, DCH_SS, true, FROM_CHAR_DATE_NONE},
{"tz", 2, DCH_tz, false, FROM_CHAR_DATE_NONE}, /* t */
{"us", 2, DCH_US, true, FROM_CHAR_DATE_NONE}, /* u */
@ -920,10 +924,10 @@ static const int DCH_index[KeyWord_INDEX_SIZE] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, DCH_A_D, DCH_B_C, DCH_CC, DCH_DAY, -1,
DCH_FF1, -1, DCH_HH24, DCH_IDDD, DCH_J, -1, -1, DCH_MI, -1, DCH_OF,
DCH_P_M, DCH_Q, DCH_RM, DCH_SSSS, DCH_TZH, DCH_US, -1, DCH_WW, -1, DCH_Y_YYY,
DCH_P_M, DCH_Q, DCH_RM, DCH_SSSSS, DCH_TZH, DCH_US, -1, DCH_WW, -1, DCH_Y_YYY,
-1, -1, -1, -1, -1, -1, -1, DCH_a_d, DCH_b_c, DCH_cc,
DCH_day, -1, DCH_ff1, -1, DCH_hh24, DCH_iddd, DCH_j, -1, -1, DCH_mi,
-1, -1, DCH_p_m, DCH_q, DCH_rm, DCH_ssss, DCH_tz, DCH_us, -1, DCH_ww,
-1, -1, DCH_p_m, DCH_q, DCH_rm, DCH_sssss, DCH_tz, DCH_us, -1, DCH_ww,
-1, DCH_y_yyy, -1, -1, -1, -1
/*---- chars over 126 are skipped ----*/