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Add functions min_scale(numeric) and trim_scale(numeric).

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These allow better control of trailing zeroes in numeric values.

Pavel Stehule, based on an old proposal of Marko Tiikkaja's;
review by Karl Pinc

Discussion: https://postgr.es/m/CAFj8pRDjs-navGASeF0Wk74N36YGFJ+v=Ok9_knRa7vDc-qugg@mail.gmail.com
This commit is contained in:
Tom Lane
2020-01-06 12:13:53 -05:00
parent b9c130a1fd
commit 20d6225d16
6 changed files with 285 additions and 3 deletions
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32
doc/src/sgml/func.sgml
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@ -918,6 +918,20 @@
<entry><literal>6.0000000000</literal></entry>
</row>
<row>
<entry>
<indexterm>
<primary>min_scale</primary>
</indexterm>
<literal><function>min_scale(<type>numeric</type>)</function></literal>
</entry>
<entry><type>integer</type></entry>
<entry>minimum scale (number of fractional decimal digits) needed
to represent the supplied value</entry>
<entry><literal>min_scale(8.4100)</literal></entry>
<entry><literal>2</literal></entry>
</row>
<row>
<entry>
<indexterm>
@ -1011,8 +1025,8 @@
</entry>
<entry><type>integer</type></entry>
<entry>scale of the argument (the number of decimal digits in the fractional part)</entry>
<entry><literal>scale(8.41)</literal></entry>
<entry><literal>2</literal></entry>
<entry><literal>scale(8.4100)</literal></entry>
<entry><literal>4</literal></entry>
</row>
<row>
@ -1041,6 +1055,20 @@
<entry><literal>1.4142135623731</literal></entry>
</row>
<row>
<entry>
<indexterm>
<primary>trim_scale</primary>
</indexterm>
<literal><function>trim_scale(<type>numeric</type>)</function></literal>
</entry>
<entry><type>numeric</type></entry>
<entry>reduce the scale (number of fractional decimal digits) by
removing trailing zeroes</entry>
<entry><literal>trim_scale(8.4100)</literal></entry>
<entry><literal>8.41</literal></entry>
</row>
<row>
<entry>
<indexterm>