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alecgrieseralecgrieser
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Add more prefix-based tests to like.yamsql (#3536)
This adds an additional set of tests to `like.yamsql` that are designed to handle prefix scans where the prefix can be satisfied by an index. Our logic currently doesn't handle transforming `LIKE '${str}%'` into a tuple scan with a range like `[PREFIX_STRING ${str}]`, which means that we don't use the index as efficiently as we could. This is shown in the `explain`s here, where we only use the index in order to get a set of covering fields, but we don't add it to a scan range. Note that this is relevant to #3523 (addressing #1076), as if we did turn those kinds of `LIKE` expressions into prefix string scans, we'd get mixed-mode coverage of the fix for the bug being addressed there. AFAIK, there isn't any other SQL comparison that we have that we could use to generate prefix string scans in some other way.
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‎yaml-tests/src/test/resources/like.metrics.binpb‎

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�
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unnamed-3)EXPLAIN select * from C WHERE C2 LIKE '%'�
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���� K ב�(0̊Z8&@YCOVERING(C2 <,> -> [C1: KEY[2], C2: KEY[0]]) | FILTER _.C2 LIKE @c8 ESCAPE 'null' | FETCH�digraph G {
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2 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Predicate Filter</td></tr><tr><td align="left">WHERE q37.C2 LIKE @c8 ESCAPE &#39;null&#39;</td></tr></table>> color="black" shape="plain" style="solid" fillcolor="black" fontname="courier" fontsize="8" tooltip="RELATION(INT AS C1, )" ];
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3 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Covering Index Scan</td></tr><tr><td align="left">range: &lt;-∞, ∞&gt;</td></tr></table>> color="black" shape="plain" style="solid" fillcolor="black" fontname="courier" fontsize="8" tooltip="RELATION(INT AS C1, )" ];
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}�
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unnamed-3*EXPLAIN select * from C WHERE C2 LIKE 'a%'�
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����&K ��(0ɺ�8&@YCOVERING(C2 <,> -> [C1: KEY[2], C2: KEY[0]]) | FILTER _.C2 LIKE @c8 ESCAPE 'null' | FETCH�digraph G {
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2 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Predicate Filter</td></tr><tr><td align="left">WHERE q37.C2 LIKE @c8 ESCAPE &#39;null&#39;</td></tr></table>> color="black" shape="plain" style="solid" fillcolor="black" fontname="courier" fontsize="8" tooltip="RELATION(INT AS C1, )" ];
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3 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Covering Index Scan</td></tr><tr><td align="left">range: &lt;-∞, ∞&gt;</td></tr></table>> color="black" shape="plain" style="solid" fillcolor="black" fontname="courier" fontsize="8" tooltip="RELATION(INT AS C1, )" ];
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}�
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unnamed-3+EXPLAIN select * from C WHERE C2 LIKE 'ap%'�
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���� K ���(0��J8&@YCOVERING(C2 <,> -> [C1: KEY[2], C2: KEY[0]]) | FILTER _.C2 LIKE @c8 ESCAPE 'null' | FETCH�digraph G {
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2 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Predicate Filter</td></tr><tr><td align="left">WHERE q37.C2 LIKE @c8 ESCAPE &#39;null&#39;</td></tr></table>> color="black" shape="plain" style="solid" fillcolor="black" fontname="courier" fontsize="8" tooltip="RELATION(INT AS C1, )" ];
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3 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Covering Index Scan</td></tr><tr><td align="left">range: &lt;-∞, ∞&gt;</td></tr></table>> color="black" shape="plain" style="solid" fillcolor="black" fontname="courier" fontsize="8" tooltip="RELATION(INT AS C1, )" ];
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4 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Index</td></tr><tr><td align="left">C2</td></tr></table>> color="black" shape="plain" style="filled" fillcolor="lightblue" fontname="courier" fontsize="8" tooltip="RELATION(INT AS C1, )" ];
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2 -> 1 [ label=<&nbsp;q39> label="q39" color="gray20" style="bold" fontname="courier" fontsize="8" arrowhead="normal" arrowtail="none" dir="both" ];
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}�
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unnamed-3,EXPLAIN select * from C WHERE C2 LIKE 'a%l%'�
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�ҽ�K ���(0�G8&@YCOVERING(C2 <,> -> [C1: KEY[2], C2: KEY[0]]) | FILTER _.C2 LIKE @c8 ESCAPE 'null' | FETCH�digraph G {
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1 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Fetch Records</td></tr></table>> color="black" shape="plain" style="solid" fillcolor="black" fontname="courier" fontsize="12" tooltip="RELATION(INT AS C1, )" ];
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2 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Predicate Filter</td></tr><tr><td align="left">WHERE q37.C2 LIKE @c8 ESCAPE &#39;null&#39;</td></tr></table>> color="black" shape="plain" style="solid" fillcolor="black" fontname="courier" fontsize="8" tooltip="RELATION(INT AS C1, )" ];
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3 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Covering Index Scan</td></tr><tr><td align="left">range: &lt;-∞, ∞&gt;</td></tr></table>> color="black" shape="plain" style="solid" fillcolor="black" fontname="courier" fontsize="8" tooltip="RELATION(INT AS C1, )" ];
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4 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Index</td></tr><tr><td align="left">C2</td></tr></table>> color="black" shape="plain" style="filled" fillcolor="lightblue" fontname="courier" fontsize="8" tooltip="RELATION(INT AS C1, )" ];
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3 -> 2 [ label=<&nbsp;q37> label="q37" color="gray20" style="bold" fontname="courier" fontsize="8" arrowhead="normal" arrowtail="none" dir="both" ];
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4 -> 3 [ color="gray20" style="solid" fontname="courier" fontsize="8" arrowhead="normal" arrowtail="none" dir="both" ];
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}�
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unnamed-3+EXPLAIN select * from C WHERE C2 LIKE 'ca%'�
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����K ���(0��e8&@YCOVERING(C2 <,> -> [C1: KEY[2], C2: KEY[0]]) | FILTER _.C2 LIKE @c8 ESCAPE 'null' | FETCH�digraph G {
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2 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Predicate Filter</td></tr><tr><td align="left">WHERE q37.C2 LIKE @c8 ESCAPE &#39;null&#39;</td></tr></table>> color="black" shape="plain" style="solid" fillcolor="black" fontname="courier" fontsize="8" tooltip="RELATION(INT AS C1, )" ];
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3 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Covering Index Scan</td></tr><tr><td align="left">range: &lt;-∞, ∞&gt;</td></tr></table>> color="black" shape="plain" style="solid" fillcolor="black" fontname="courier" fontsize="8" tooltip="RELATION(INT AS C1, )" ];
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3 -> 2 [ label=<&nbsp;q37> label="q37" color="gray20" style="bold" fontname="courier" fontsize="8" arrowhead="normal" arrowtail="none" dir="both" ];
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4 -> 3 [ color="gray20" style="solid" fontname="courier" fontsize="8" arrowhead="normal" arrowtail="none" dir="both" ];
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}�
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:
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unnamed-3-EXPLAIN select * from C WHERE C2 LIKE 'ca_al'�
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����&K ���(0₮8&@YCOVERING(C2 <,> -> [C1: KEY[2], C2: KEY[0]]) | FILTER _.C2 LIKE @c8 ESCAPE 'null' | FETCH�digraph G {
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1 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Fetch Records</td></tr></table>> color="black" shape="plain" style="solid" fillcolor="black" fontname="courier" fontsize="12" tooltip="RELATION(INT AS C1, )" ];
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2 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Predicate Filter</td></tr><tr><td align="left">WHERE q37.C2 LIKE @c8 ESCAPE &#39;null&#39;</td></tr></table>> color="black" shape="plain" style="solid" fillcolor="black" fontname="courier" fontsize="8" tooltip="RELATION(INT AS C1, )" ];
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3 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Covering Index Scan</td></tr><tr><td align="left">range: &lt;-∞, ∞&gt;</td></tr></table>> color="black" shape="plain" style="solid" fillcolor="black" fontname="courier" fontsize="8" tooltip="RELATION(INT AS C1, )" ];
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}�
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unnamed-3-EXPLAIN select * from C WHERE C2 LIKE 'ca%al'�
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����K ���(0��68&@YCOVERING(C2 <,> -> [C1: KEY[2], C2: KEY[0]]) | FILTER _.C2 LIKE @c8 ESCAPE 'null' | FETCH�digraph G {
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1 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Fetch Records</td></tr></table>> color="black" shape="plain" style="solid" fillcolor="black" fontname="courier" fontsize="12" tooltip="RELATION(INT AS C1, )" ];
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2 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Predicate Filter</td></tr><tr><td align="left">WHERE q37.C2 LIKE @c8 ESCAPE &#39;null&#39;</td></tr></table>> color="black" shape="plain" style="solid" fillcolor="black" fontname="courier" fontsize="8" tooltip="RELATION(INT AS C1, )" ];
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3 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Covering Index Scan</td></tr><tr><td align="left">range: &lt;-∞, ∞&gt;</td></tr></table>> color="black" shape="plain" style="solid" fillcolor="black" fontname="courier" fontsize="8" tooltip="RELATION(INT AS C1, )" ];
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4 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Index</td></tr><tr><td align="left">C2</td></tr></table>> color="black" shape="plain" style="filled" fillcolor="lightblue" fontname="courier" fontsize="8" tooltip="RELATION(INT AS C1, )" ];
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2 -> 1 [ label=<&nbsp;q39> label="q39" color="gray20" style="bold" fontname="courier" fontsize="8" arrowhead="normal" arrowtail="none" dir="both" ];
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}�
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;
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unnamed-3.EXPLAIN select * from C WHERE C2 LIKE 'ca_al%'�
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����&K �Ջ(0䬲8&@YCOVERING(C2 <,> -> [C1: KEY[2], C2: KEY[0]]) | FILTER _.C2 LIKE @c8 ESCAPE 'null' | FETCH�digraph G {
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2 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Predicate Filter</td></tr><tr><td align="left">WHERE q37.C2 LIKE @c8 ESCAPE &#39;null&#39;</td></tr></table>> color="black" shape="plain" style="solid" fillcolor="black" fontname="courier" fontsize="8" tooltip="RELATION(INT AS C1, )" ];
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3 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Covering Index Scan</td></tr><tr><td align="left">range: &lt;-∞, ∞&gt;</td></tr></table>> color="black" shape="plain" style="solid" fillcolor="black" fontname="courier" fontsize="8" tooltip="RELATION(INT AS C1, )" ];
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4 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Index</td></tr><tr><td align="left">C2</td></tr></table>> color="black" shape="plain" style="filled" fillcolor="lightblue" fontname="courier" fontsize="8" tooltip="RELATION(INT AS C1, )" ];
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3 -> 2 [ label=<&nbsp;q37> label="q37" color="gray20" style="bold" fontname="courier" fontsize="8" arrowhead="normal" arrowtail="none" dir="both" ];
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4 -> 3 [ color="gray20" style="solid" fontname="courier" fontsize="8" arrowhead="normal" arrowtail="none" dir="both" ];
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2 -> 1 [ label=<&nbsp;q39> label="q39" color="gray20" style="bold" fontname="courier" fontsize="8" arrowhead="normal" arrowtail="none" dir="both" ];
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}�
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;
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unnamed-3.EXPLAIN select * from C WHERE C2 LIKE 'ca%al%'�
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��K �·(0��H8&@YCOVERING(C2 <,> -> [C1: KEY[2], C2: KEY[0]]) | FILTER _.C2 LIKE @c8 ESCAPE 'null' | FETCH�digraph G {
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fontname=courier;
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2 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Predicate Filter</td></tr><tr><td align="left">WHERE q37.C2 LIKE @c8 ESCAPE &#39;null&#39;</td></tr></table>> color="black" shape="plain" style="solid" fillcolor="black" fontname="courier" fontsize="8" tooltip="RELATION(INT AS C1, )" ];
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3 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Covering Index Scan</td></tr><tr><td align="left">range: &lt;-∞, ∞&gt;</td></tr></table>> color="black" shape="plain" style="solid" fillcolor="black" fontname="courier" fontsize="8" tooltip="RELATION(INT AS C1, )" ];
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4 [ label=<<table border="0" cellborder="1" cellspacing="0" cellpadding="8"><tr><td align="left">Index</td></tr><tr><td align="left">C2</td></tr></table>> color="black" shape="plain" style="filled" fillcolor="lightblue" fontname="courier" fontsize="8" tooltip="RELATION(INT AS C1, )" ];
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3 -> 2 [ label=<&nbsp;q37> label="q37" color="gray20" style="bold" fontname="courier" fontsize="8" arrowhead="normal" arrowtail="none" dir="both" ];
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4 -> 3 [ color="gray20" style="solid" fontname="courier" fontsize="8" arrowhead="normal" arrowtail="none" dir="both" ];
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2 -> 1 [ label=<&nbsp;q39> label="q39" color="gray20" style="bold" fontname="courier" fontsize="8" arrowhead="normal" arrowtail="none" dir="both" ];
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}

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